diff --git a/mitmproxy/cmdline.py b/mitmproxy/cmdline.py
index 8476f6f33..5ea76e44c 100644
--- a/mitmproxy/cmdline.py
+++ b/mitmproxy/cmdline.py
@@ -6,8 +6,9 @@ import base64
 import configargparse
 
 from netlib.tcp import Address, sslversion_choices
-import netlib.utils
-from . import filt, utils, version
+import netlib.http.url
+from netlib import human
+from . import filt, version
 from .proxy import config
 
 APP_HOST = "mitm.it"
@@ -105,7 +106,7 @@ def parse_setheader(s):
 
 def parse_server_spec(url):
     try:
-        p = netlib.utils.parse_url(url)
+        p = netlib.http.url.parse(url)
         if p[0] not in ("http", "https"):
             raise ValueError()
     except ValueError:
@@ -135,7 +136,9 @@ def get_common_options(options):
     if options.stickyauth_filt:
         stickyauth = options.stickyauth_filt
 
-    stream_large_bodies = utils.parse_size(options.stream_large_bodies)
+    stream_large_bodies = options.stream_large_bodies
+    if stream_large_bodies:
+        stream_large_bodies = human.parse_size(stream_large_bodies)
 
     reps = []
     for i in options.replace:
diff --git a/mitmproxy/console/common.py b/mitmproxy/console/common.py
index ba5cfd620..a3ed5dc81 100644
--- a/mitmproxy/console/common.py
+++ b/mitmproxy/console/common.py
@@ -4,7 +4,8 @@ import urwid
 import urwid.util
 import os
 
-import netlib.utils
+import netlib
+from netlib import human
 
 from .. import utils
 from .. import flow
@@ -419,7 +420,7 @@ def format_flow(f, focus, extended=False, hostheader=False, marked=False):
     )
     if f.response:
         if f.response.content:
-            contentdesc = netlib.utils.pretty_size(len(f.response.content))
+            contentdesc = human.pretty_size(len(f.response.content))
         elif f.response.content is None:
             contentdesc = "[content missing]"
         else:
@@ -427,7 +428,7 @@ def format_flow(f, focus, extended=False, hostheader=False, marked=False):
         duration = 0
         if f.response.timestamp_end and f.request.timestamp_start:
             duration = f.response.timestamp_end - f.request.timestamp_start
-        roundtrip = utils.pretty_duration(duration)
+        roundtrip = human.pretty_duration(duration)
 
         d.update(dict(
             resp_code = f.response.status_code,
diff --git a/mitmproxy/console/flowlist.py b/mitmproxy/console/flowlist.py
index 78b30231c..1e65e3ebf 100644
--- a/mitmproxy/console/flowlist.py
+++ b/mitmproxy/console/flowlist.py
@@ -1,7 +1,7 @@
 from __future__ import absolute_import
 import urwid
 
-import netlib.utils
+import netlib.http.url
 
 from . import common, signals
 
@@ -343,7 +343,7 @@ class FlowListBox(urwid.ListBox):
         )
 
     def new_request(self, url, method):
-        parts = netlib.utils.parse_url(str(url))
+        parts = netlib.http.url.parse(str(url))
         if not parts:
             signals.status_message.send(message="Invalid Url")
             return
diff --git a/mitmproxy/console/statusbar.py b/mitmproxy/console/statusbar.py
index 4cc63a54a..d57ac69cc 100644
--- a/mitmproxy/console/statusbar.py
+++ b/mitmproxy/console/statusbar.py
@@ -3,6 +3,7 @@ import os.path
 import urwid
 
 import netlib.utils
+from netlib import human
 from . import pathedit, signals, common
 
 
@@ -193,7 +194,7 @@ class StatusBar(urwid.WidgetWrap):
             opts.append("following")
         if self.master.stream_large_bodies:
             opts.append(
-                "stream:%s" % netlib.utils.pretty_size(
+                "stream:%s" % human.pretty_size(
                     self.master.stream_large_bodies.max_size
                 )
             )
@@ -203,7 +204,7 @@ class StatusBar(urwid.WidgetWrap):
 
         if self.master.server.config.mode in ["reverse", "upstream"]:
             dst = self.master.server.config.upstream_server
-            r.append("[dest:%s]" % netlib.utils.unparse_url(
+            r.append("[dest:%s]" % netlib.utils.unparse(
                 dst.scheme,
                 dst.address.host,
                 dst.address.port
diff --git a/mitmproxy/contentviews.py b/mitmproxy/contentviews.py
index 1b0f389fb..08a7e446f 100644
--- a/mitmproxy/contentviews.py
+++ b/mitmproxy/contentviews.py
@@ -27,7 +27,9 @@ import html2text
 import six
 from netlib.odict import ODict
 from netlib import encoding
-from netlib.utils import clean_bin, hexdump, urldecode, multipartdecode, parse_content_type
+import netlib.http.headers
+from netlib.http import url, multipart
+from netlib.utils import clean_bin, hexdump
 from . import utils
 from .exceptions import ContentViewException
 from .contrib import jsbeautifier
@@ -120,7 +122,7 @@ class ViewAuto(View):
         headers = metadata.get("headers", {})
         ctype = headers.get("content-type")
         if data and ctype:
-            ct = parse_content_type(ctype) if ctype else None
+            ct = netlib.http.headers.parse_content_type(ctype) if ctype else None
             ct = "%s/%s" % (ct[0], ct[1])
             if ct in content_types_map:
                 return content_types_map[ct][0](data, **metadata)
@@ -257,7 +259,7 @@ class ViewURLEncoded(View):
     content_types = ["application/x-www-form-urlencoded"]
 
     def __call__(self, data, **metadata):
-        d = urldecode(data)
+        d = url.decode(data)
         return "URLEncoded form", format_dict(ODict(d))
 
 
@@ -274,7 +276,7 @@ class ViewMultipart(View):
 
     def __call__(self, data, **metadata):
         headers = metadata.get("headers", {})
-        v = multipartdecode(headers, data)
+        v = multipart.decode(headers, data)
         if v:
             return "Multipart form", self._format(v)
 
diff --git a/mitmproxy/dump.py b/mitmproxy/dump.py
index 4443995aa..0f54b4d40 100644
--- a/mitmproxy/dump.py
+++ b/mitmproxy/dump.py
@@ -4,8 +4,8 @@ import sys
 import click
 import itertools
 
-from netlib import tcp
-from netlib.utils import bytes_to_escaped_str, pretty_size
+from netlib import tcp, human
+from netlib.utils import bytes_to_escaped_str
 from . import flow, filt, contentviews, controller
 from .exceptions import ContentViewException, FlowReadException, ScriptException
 
@@ -287,7 +287,7 @@ class DumpMaster(flow.FlowMaster):
         if flow.response.content is None:
             size = "(content missing)"
         else:
-            size = pretty_size(len(flow.response.content))
+            size = human.pretty_size(len(flow.response.content))
         size = click.style(size, bold=True)
 
         arrows = click.style("<<", bold=True)
diff --git a/mitmproxy/flow/export.py b/mitmproxy/flow/export.py
index d2c7bceb5..c2f54554d 100644
--- a/mitmproxy/flow/export.py
+++ b/mitmproxy/flow/export.py
@@ -5,7 +5,7 @@ from textwrap import dedent
 from six.moves.urllib.parse import quote, quote_plus
 
 import netlib.http
-from netlib.utils import parse_content_type
+import netlib.http.headers
 
 
 def curl_command(flow):
@@ -88,7 +88,7 @@ def raw_request(flow):
 
 def is_json(headers, content):
     if headers:
-        ct = parse_content_type(headers.get("content-type", ""))
+        ct = netlib.http.headers.parse_content_type(headers.get("content-type", ""))
         if ct and "%s/%s" % (ct[0], ct[1]) == "application/json":
             try:
                 return json.loads(content)
diff --git a/mitmproxy/models/tcp.py b/mitmproxy/models/tcp.py
index b87a74acf..c7cfb9f8a 100644
--- a/mitmproxy/models/tcp.py
+++ b/mitmproxy/models/tcp.py
@@ -1,11 +1,11 @@
 import time
 from typing import List
 
-from netlib.utils import Serializable
+import netlib.basetypes
 from .flow import Flow
 
 
-class TCPMessage(Serializable):
+class TCPMessage(netlib.basetypes.Serializable):
 
     def __init__(self, from_client, content, timestamp=None):
         self.content = content
diff --git a/mitmproxy/protocol/http2.py b/mitmproxy/protocol/http2.py
index 30763c664..6ca783478 100644
--- a/mitmproxy/protocol/http2.py
+++ b/mitmproxy/protocol/http2.py
@@ -14,7 +14,8 @@ from hyperframe.frame import PriorityFrame
 from netlib.tcp import ssl_read_select
 from netlib.exceptions import HttpException
 from netlib.http import Headers
-from netlib.utils import http2_read_raw_frame, parse_url
+from netlib.http.http2 import framereader
+import netlib.http.url
 
 from .base import Layer
 from .http import _HttpTransmissionLayer, HttpLayer
@@ -233,7 +234,7 @@ class Http2Layer(Layer):
 
                 with source_conn.h2.lock:
                     try:
-                        raw_frame = b''.join(http2_read_raw_frame(source_conn.rfile))
+                        raw_frame = b''.join(framereader.http2_read_raw_frame(source_conn.rfile))
                     except:
                         # read frame failed: connection closed
                         self._kill_all_streams()
@@ -306,6 +307,9 @@ class Http2SingleStreamLayer(_HttpTransmissionLayer, threading.Thread):
         method = self.request_headers.get(':method', 'GET')
         scheme = self.request_headers.get(':scheme', 'https')
         path = self.request_headers.get(':path', '/')
+        self.request_headers.clear(":method")
+        self.request_headers.clear(":scheme")
+        self.request_headers.clear(":path")
         host = None
         port = None
 
@@ -316,7 +320,7 @@ class Http2SingleStreamLayer(_HttpTransmissionLayer, threading.Thread):
         else:  # pragma: no cover
             first_line_format = "absolute"
             # FIXME: verify if path or :host contains what we need
-            scheme, host, port, _ = parse_url(path)
+            scheme, host, port, _ = netlib.http.url.parse(path)
 
         if authority:
             host, _, port = authority.partition(':')
@@ -362,10 +366,15 @@ class Http2SingleStreamLayer(_HttpTransmissionLayer, threading.Thread):
             self.server_stream_id = self.server_conn.h2.get_next_available_stream_id()
             self.server_to_client_stream_ids[self.server_stream_id] = self.client_stream_id
 
+            headers = message.headers.copy()
+            headers.insert(0, ":path", message.path)
+            headers.insert(0, ":method", message.method)
+            headers.insert(0, ":scheme", message.scheme)
+
             self.server_conn.h2.safe_send_headers(
                 self.is_zombie,
                 self.server_stream_id,
-                message.headers
+                headers
             )
         self.server_conn.h2.safe_send_body(
             self.is_zombie,
@@ -379,12 +388,14 @@ class Http2SingleStreamLayer(_HttpTransmissionLayer, threading.Thread):
         self.response_arrived.wait()
 
         status_code = int(self.response_headers.get(':status', 502))
+        headers = self.response_headers.copy()
+        headers.clear(":status")
 
         return HTTPResponse(
             http_version=b"HTTP/2.0",
             status_code=status_code,
             reason='',
-            headers=self.response_headers,
+            headers=headers,
             content=None,
             timestamp_start=self.timestamp_start,
             timestamp_end=self.timestamp_end,
@@ -404,10 +415,12 @@ class Http2SingleStreamLayer(_HttpTransmissionLayer, threading.Thread):
                 raise Http2ProtocolException("Zombie Stream")
 
     def send_response_headers(self, response):
+        headers = response.headers.copy()
+        headers.insert(0, ":status", str(response.status_code))
         self.client_conn.h2.safe_send_headers(
             self.is_zombie,
             self.client_stream_id,
-            response.headers
+            headers
         )
         if self.zombie:  # pragma: no cover
             raise Http2ProtocolException("Zombie Stream")
diff --git a/mitmproxy/proxy/config.py b/mitmproxy/proxy/config.py
index b08470bd7..163e92dd2 100644
--- a/mitmproxy/proxy/config.py
+++ b/mitmproxy/proxy/config.py
@@ -6,11 +6,11 @@ import re
 import six
 from OpenSSL import SSL
 
-from netlib import certutils, tcp
+from netlib import certutils, tcp, human
 from netlib.http import authentication
 from netlib.tcp import Address, sslversion_choices
 
-from .. import utils, platform
+from .. import platform
 
 CONF_BASENAME = "mitmproxy"
 CA_DIR = "~/.mitmproxy"
@@ -125,7 +125,9 @@ class ProxyConfig:
 
 
 def process_proxy_options(parser, options):
-    body_size_limit = utils.parse_size(options.body_size_limit)
+    body_size_limit = options.body_size_limit
+    if body_size_limit:
+        body_size_limit = human.parse_size(body_size_limit)
 
     c = 0
     mode, upstream_server, upstream_auth = "regular", None, None
diff --git a/mitmproxy/stateobject.py b/mitmproxy/stateobject.py
index 765c35d6c..eb57fa00a 100644
--- a/mitmproxy/stateobject.py
+++ b/mitmproxy/stateobject.py
@@ -3,7 +3,7 @@ from __future__ import absolute_import
 import six
 from typing import List, Any
 
-from netlib.utils import Serializable
+import netlib.basetypes
 
 
 def _is_list(cls):
@@ -13,7 +13,7 @@ def _is_list(cls):
     return issubclass(cls, List) or is_list_bugfix
 
 
-class StateObject(Serializable):
+class StateObject(netlib.basetypes.Serializable):
 
     """
     An object with serializable state.
diff --git a/mitmproxy/utils.py b/mitmproxy/utils.py
index e56ac473c..053425004 100644
--- a/mitmproxy/utils.py
+++ b/mitmproxy/utils.py
@@ -58,20 +58,6 @@ def pretty_json(s):
     return json.dumps(p, sort_keys=True, indent=4)
 
 
-def pretty_duration(secs):
-    formatters = [
-        (100, "{:.0f}s"),
-        (10, "{:2.1f}s"),
-        (1, "{:1.2f}s"),
-    ]
-
-    for limit, formatter in formatters:
-        if secs >= limit:
-            return formatter.format(secs)
-    # less than 1 sec
-    return "{:.0f}ms".format(secs * 1000)
-
-
 pkg_data = netlib.utils.Data(__name__)
 
 
@@ -117,32 +103,3 @@ def clean_hanging_newline(t):
     if t and t[-1] == "\n":
         return t[:-1]
     return t
-
-
-def parse_size(s):
-    """
-        Parses a size specification. Valid specifications are:
-
-            123: bytes
-            123k: kilobytes
-            123m: megabytes
-            123g: gigabytes
-    """
-    if not s:
-        return None
-    mult = None
-    if s[-1].lower() == "k":
-        mult = 1024**1
-    elif s[-1].lower() == "m":
-        mult = 1024**2
-    elif s[-1].lower() == "g":
-        mult = 1024**3
-
-    if mult:
-        s = s[:-1]
-    else:
-        mult = 1
-    try:
-        return int(s) * mult
-    except ValueError:
-        raise ValueError("Invalid size specification: %s" % s)
diff --git a/netlib/basetypes.py b/netlib/basetypes.py
new file mode 100644
index 000000000..9d6c60ba1
--- /dev/null
+++ b/netlib/basetypes.py
@@ -0,0 +1,34 @@
+import six
+import abc
+
+
+@six.add_metaclass(abc.ABCMeta)
+class Serializable(object):
+    """
+    Abstract Base Class that defines an API to save an object's state and restore it later on.
+    """
+
+    @classmethod
+    @abc.abstractmethod
+    def from_state(cls, state):
+        """
+        Create a new object from the given state.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def get_state(self):
+        """
+        Retrieve object state.
+        """
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def set_state(self, state):
+        """
+        Set object state to the given state.
+        """
+        raise NotImplementedError()
+
+    def copy(self):
+        return self.from_state(self.get_state())
diff --git a/netlib/certutils.py b/netlib/certutils.py
index 34e01ed37..4a19d170a 100644
--- a/netlib/certutils.py
+++ b/netlib/certutils.py
@@ -12,7 +12,7 @@ from pyasn1.codec.der.decoder import decode
 from pyasn1.error import PyAsn1Error
 import OpenSSL
 
-from .utils import Serializable
+from . import basetypes
 
 # Default expiry must not be too long: https://github.com/mitmproxy/mitmproxy/issues/815
 
@@ -364,7 +364,7 @@ class _GeneralNames(univ.SequenceOf):
         constraint.ValueSizeConstraint(1, 1024)
 
 
-class SSLCert(Serializable):
+class SSLCert(basetypes.Serializable):
 
     def __init__(self, cert):
         """
diff --git a/netlib/http/headers.py b/netlib/http/headers.py
index 6165fd616..fa7b71808 100644
--- a/netlib/http/headers.py
+++ b/netlib/http/headers.py
@@ -175,3 +175,30 @@ class Headers(MultiDict):
             fields.append([name, value])
         self.fields = fields
         return replacements
+
+
+def parse_content_type(c):
+    """
+        A simple parser for content-type values. Returns a (type, subtype,
+        parameters) tuple, where type and subtype are strings, and parameters
+        is a dict. If the string could not be parsed, return None.
+
+        E.g. the following string:
+
+            text/html; charset=UTF-8
+
+        Returns:
+
+            ("text", "html", {"charset": "UTF-8"})
+    """
+    parts = c.split(";", 1)
+    ts = parts[0].split("/", 1)
+    if len(ts) != 2:
+        return None
+    d = {}
+    if len(parts) == 2:
+        for i in parts[1].split(";"):
+            clause = i.split("=", 1)
+            if len(clause) == 2:
+                d[clause[0].strip()] = clause[1].strip()
+    return ts[0].lower(), ts[1].lower(), d
diff --git a/netlib/http/http1/read.py b/netlib/http/http1/read.py
index d30976bdd..5783ec67d 100644
--- a/netlib/http/http1/read.py
+++ b/netlib/http/http1/read.py
@@ -6,6 +6,19 @@ import re
 from ... import utils
 from ...exceptions import HttpReadDisconnect, HttpSyntaxException, HttpException, TcpDisconnect
 from .. import Request, Response, Headers
+from .. import url
+
+
+def get_header_tokens(headers, key):
+    """
+        Retrieve all tokens for a header key. A number of different headers
+        follow a pattern where each header line can containe comma-separated
+        tokens, and headers can be set multiple times.
+    """
+    if key not in headers:
+        return []
+    tokens = headers[key].split(",")
+    return [token.strip() for token in tokens]
 
 
 def read_request(rfile, body_size_limit=None):
@@ -147,7 +160,7 @@ def connection_close(http_version, headers):
     """
     # At first, check if we have an explicit Connection header.
     if "connection" in headers:
-        tokens = utils.get_header_tokens(headers, "connection")
+        tokens = get_header_tokens(headers, "connection")
         if "close" in tokens:
             return True
         elif "keep-alive" in tokens:
@@ -240,7 +253,7 @@ def _read_request_line(rfile):
             scheme, path = None, None
         else:
             form = "absolute"
-            scheme, host, port, path = utils.parse_url(path)
+            scheme, host, port, path = url.parse(path)
 
         _check_http_version(http_version)
     except ValueError:
diff --git a/netlib/http/http2/connections.py b/netlib/http/http2/connections.py
index b988d6eff..16bdf618a 100644
--- a/netlib/http/http2/connections.py
+++ b/netlib/http/http2/connections.py
@@ -2,11 +2,12 @@ from __future__ import (absolute_import, print_function, division)
 import itertools
 import time
 
+import hyperframe.frame
+
 from hpack.hpack import Encoder, Decoder
 from ... import utils
-from .. import Headers, Response, Request
-
-from hyperframe import frame
+from .. import Headers, Response, Request, url
+from . import framereader
 
 
 class TCPHandler(object):
@@ -38,12 +39,12 @@ class HTTP2Protocol(object):
     CLIENT_CONNECTION_PREFACE = b'PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n'
 
     HTTP2_DEFAULT_SETTINGS = {
-        frame.SettingsFrame.HEADER_TABLE_SIZE: 4096,
-        frame.SettingsFrame.ENABLE_PUSH: 1,
-        frame.SettingsFrame.MAX_CONCURRENT_STREAMS: None,
-        frame.SettingsFrame.INITIAL_WINDOW_SIZE: 2 ** 16 - 1,
-        frame.SettingsFrame.MAX_FRAME_SIZE: 2 ** 14,
-        frame.SettingsFrame.MAX_HEADER_LIST_SIZE: None,
+        hyperframe.frame.SettingsFrame.HEADER_TABLE_SIZE: 4096,
+        hyperframe.frame.SettingsFrame.ENABLE_PUSH: 1,
+        hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: None,
+        hyperframe.frame.SettingsFrame.INITIAL_WINDOW_SIZE: 2 ** 16 - 1,
+        hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE: 2 ** 14,
+        hyperframe.frame.SettingsFrame.MAX_HEADER_LIST_SIZE: None,
     }
 
     def __init__(
@@ -98,6 +99,11 @@ class HTTP2Protocol(object):
         method = headers.get(':method', 'GET')
         scheme = headers.get(':scheme', 'https')
         path = headers.get(':path', '/')
+
+        headers.clear(":method")
+        headers.clear(":scheme")
+        headers.clear(":path")
+
         host = None
         port = None
 
@@ -112,7 +118,7 @@ class HTTP2Protocol(object):
         else:
             first_line_format = "absolute"
             # FIXME: verify if path or :host contains what we need
-            scheme, host, port, _ = utils.parse_url(path)
+            scheme, host, port, _ = url.parse(path)
             scheme = scheme.decode('ascii')
             host = host.decode('ascii')
 
@@ -202,12 +208,9 @@ class HTTP2Protocol(object):
 
         if ':authority' not in headers:
             headers.insert(0, b':authority', authority.encode('ascii'))
-        if ':scheme' not in headers:
-            headers.insert(0, b':scheme', request.scheme.encode('ascii'))
-        if ':path' not in headers:
-            headers.insert(0, b':path', request.path.encode('ascii'))
-        if ':method' not in headers:
-            headers.insert(0, b':method', request.method.encode('ascii'))
+        headers.insert(0, b':scheme', request.scheme.encode('ascii'))
+        headers.insert(0, b':path', request.path.encode('ascii'))
+        headers.insert(0, b':method', request.method.encode('ascii'))
 
         if hasattr(request, 'stream_id'):
             stream_id = request.stream_id
@@ -251,9 +254,9 @@ class HTTP2Protocol(object):
             magic = self.tcp_handler.rfile.safe_read(magic_length)
             assert magic == self.CLIENT_CONNECTION_PREFACE
 
-            frm = frame.SettingsFrame(settings={
-                frame.SettingsFrame.ENABLE_PUSH: 0,
-                frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 1,
+            frm = hyperframe.frame.SettingsFrame(settings={
+                hyperframe.frame.SettingsFrame.ENABLE_PUSH: 0,
+                hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 1,
             })
             self.send_frame(frm, hide=True)
             self._receive_settings(hide=True)
@@ -264,7 +267,7 @@ class HTTP2Protocol(object):
 
             self.tcp_handler.wfile.write(self.CLIENT_CONNECTION_PREFACE)
 
-            self.send_frame(frame.SettingsFrame(), hide=True)
+            self.send_frame(hyperframe.frame.SettingsFrame(), hide=True)
             self._receive_settings(hide=True)  # server announces own settings
             self._receive_settings(hide=True)  # server acks my settings
 
@@ -277,18 +280,18 @@ class HTTP2Protocol(object):
 
     def read_frame(self, hide=False):
         while True:
-            frm = utils.http2_read_frame(self.tcp_handler.rfile)
+            frm = framereader.http2_read_frame(self.tcp_handler.rfile)
             if not hide and self.dump_frames:  # pragma no cover
                 print(frm.human_readable("<<"))
 
-            if isinstance(frm, frame.PingFrame):
-                raw_bytes = frame.PingFrame(flags=['ACK'], payload=frm.payload).serialize()
+            if isinstance(frm, hyperframe.frame.PingFrame):
+                raw_bytes = hyperframe.frame.PingFrame(flags=['ACK'], payload=frm.payload).serialize()
                 self.tcp_handler.wfile.write(raw_bytes)
                 self.tcp_handler.wfile.flush()
                 continue
-            if isinstance(frm, frame.SettingsFrame) and 'ACK' not in frm.flags:
+            if isinstance(frm, hyperframe.frame.SettingsFrame) and 'ACK' not in frm.flags:
                 self._apply_settings(frm.settings, hide)
-            if isinstance(frm, frame.DataFrame) and frm.flow_controlled_length > 0:
+            if isinstance(frm, hyperframe.frame.DataFrame) and frm.flow_controlled_length > 0:
                 self._update_flow_control_window(frm.stream_id, frm.flow_controlled_length)
             return frm
 
@@ -300,7 +303,7 @@ class HTTP2Protocol(object):
         return True
 
     def _handle_unexpected_frame(self, frm):
-        if isinstance(frm, frame.SettingsFrame):
+        if isinstance(frm, hyperframe.frame.SettingsFrame):
             return
         if self.unhandled_frame_cb:
             self.unhandled_frame_cb(frm)
@@ -308,7 +311,7 @@ class HTTP2Protocol(object):
     def _receive_settings(self, hide=False):
         while True:
             frm = self.read_frame(hide)
-            if isinstance(frm, frame.SettingsFrame):
+            if isinstance(frm, hyperframe.frame.SettingsFrame):
                 break
             else:
                 self._handle_unexpected_frame(frm)
@@ -332,26 +335,26 @@ class HTTP2Protocol(object):
                 old_value = '-'
             self.http2_settings[setting] = value
 
-        frm = frame.SettingsFrame(flags=['ACK'])
+        frm = hyperframe.frame.SettingsFrame(flags=['ACK'])
         self.send_frame(frm, hide)
 
     def _update_flow_control_window(self, stream_id, increment):
-        frm = frame.WindowUpdateFrame(stream_id=0, window_increment=increment)
+        frm = hyperframe.frame.WindowUpdateFrame(stream_id=0, window_increment=increment)
         self.send_frame(frm)
-        frm = frame.WindowUpdateFrame(stream_id=stream_id, window_increment=increment)
+        frm = hyperframe.frame.WindowUpdateFrame(stream_id=stream_id, window_increment=increment)
         self.send_frame(frm)
 
     def _create_headers(self, headers, stream_id, end_stream=True):
         def frame_cls(chunks):
             for i in chunks:
                 if i == 0:
-                    yield frame.HeadersFrame, i
+                    yield hyperframe.frame.HeadersFrame, i
                 else:
-                    yield frame.ContinuationFrame, i
+                    yield hyperframe.frame.ContinuationFrame, i
 
         header_block_fragment = self.encoder.encode(headers.fields)
 
-        chunk_size = self.http2_settings[frame.SettingsFrame.MAX_FRAME_SIZE]
+        chunk_size = self.http2_settings[hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE]
         chunks = range(0, len(header_block_fragment), chunk_size)
         frms = [frm_cls(
             flags=[],
@@ -372,9 +375,9 @@ class HTTP2Protocol(object):
         if body is None or len(body) == 0:
             return b''
 
-        chunk_size = self.http2_settings[frame.SettingsFrame.MAX_FRAME_SIZE]
+        chunk_size = self.http2_settings[hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE]
         chunks = range(0, len(body), chunk_size)
-        frms = [frame.DataFrame(
+        frms = [hyperframe.frame.DataFrame(
             flags=[],
             stream_id=stream_id,
             data=body[i:i + chunk_size]) for i in chunks]
@@ -398,7 +401,7 @@ class HTTP2Protocol(object):
         while True:
             frm = self.read_frame()
             if (
-                (isinstance(frm, frame.HeadersFrame) or isinstance(frm, frame.ContinuationFrame)) and
+                (isinstance(frm, hyperframe.frame.HeadersFrame) or isinstance(frm, hyperframe.frame.ContinuationFrame)) and
                 (stream_id is None or frm.stream_id == stream_id)
             ):
                 stream_id = frm.stream_id
@@ -412,7 +415,7 @@ class HTTP2Protocol(object):
 
         while body_expected:
             frm = self.read_frame()
-            if isinstance(frm, frame.DataFrame) and frm.stream_id == stream_id:
+            if isinstance(frm, hyperframe.frame.DataFrame) and frm.stream_id == stream_id:
                 body += frm.data
                 if 'END_STREAM' in frm.flags:
                     break
diff --git a/netlib/http/http2/framereader.py b/netlib/http/http2/framereader.py
new file mode 100644
index 000000000..d45be6461
--- /dev/null
+++ b/netlib/http/http2/framereader.py
@@ -0,0 +1,21 @@
+import codecs
+
+import hyperframe
+
+
+def http2_read_raw_frame(rfile):
+    header = rfile.safe_read(9)
+    length = int(codecs.encode(header[:3], 'hex_codec'), 16)
+
+    if length == 4740180:
+        raise ValueError("Length field looks more like HTTP/1.1: %s" % rfile.peek(20))
+
+    body = rfile.safe_read(length)
+    return [header, body]
+
+
+def http2_read_frame(rfile):
+    header, body = http2_read_raw_frame(rfile)
+    frame, length = hyperframe.frame.Frame.parse_frame_header(header)
+    frame.parse_body(memoryview(body))
+    return frame
diff --git a/netlib/http/message.py b/netlib/http/message.py
index 13d401a74..d9654f26e 100644
--- a/netlib/http/message.py
+++ b/netlib/http/message.py
@@ -4,9 +4,8 @@ import warnings
 
 import six
 
-from .headers import Headers
-from .. import encoding, utils
-from ..utils import always_bytes
+from .. import encoding, utils, basetypes
+from . import headers
 
 if six.PY2:  # pragma: no cover
     def _native(x):
@@ -20,10 +19,10 @@ else:
         return x.decode("utf-8", "surrogateescape")
 
     def _always_bytes(x):
-        return always_bytes(x, "utf-8", "surrogateescape")
+        return utils.always_bytes(x, "utf-8", "surrogateescape")
 
 
-class MessageData(utils.Serializable):
+class MessageData(basetypes.Serializable):
     def __eq__(self, other):
         if isinstance(other, MessageData):
             return self.__dict__ == other.__dict__
@@ -38,7 +37,7 @@ class MessageData(utils.Serializable):
     def set_state(self, state):
         for k, v in state.items():
             if k == "headers":
-                v = Headers.from_state(v)
+                v = headers.Headers.from_state(v)
             setattr(self, k, v)
 
     def get_state(self):
@@ -48,11 +47,11 @@ class MessageData(utils.Serializable):
 
     @classmethod
     def from_state(cls, state):
-        state["headers"] = Headers.from_state(state["headers"])
+        state["headers"] = headers.Headers.from_state(state["headers"])
         return cls(**state)
 
 
-class Message(utils.Serializable):
+class Message(basetypes.Serializable):
     def __eq__(self, other):
         if isinstance(other, Message):
             return self.data == other.data
@@ -72,7 +71,7 @@ class Message(utils.Serializable):
 
     @classmethod
     def from_state(cls, state):
-        state["headers"] = Headers.from_state(state["headers"])
+        state["headers"] = headers.Headers.from_state(state["headers"])
         return cls(**state)
 
     @property
diff --git a/netlib/http/multipart.py b/netlib/http/multipart.py
new file mode 100644
index 000000000..a135eb863
--- /dev/null
+++ b/netlib/http/multipart.py
@@ -0,0 +1,32 @@
+import re
+
+from . import headers
+
+
+def decode(hdrs, content):
+    """
+        Takes a multipart boundary encoded string and returns list of (key, value) tuples.
+    """
+    v = hdrs.get("content-type")
+    if v:
+        v = headers.parse_content_type(v)
+        if not v:
+            return []
+        try:
+            boundary = v[2]["boundary"].encode("ascii")
+        except (KeyError, UnicodeError):
+            return []
+
+        rx = re.compile(br'\bname="([^"]+)"')
+        r = []
+
+        for i in content.split(b"--" + boundary):
+            parts = i.splitlines()
+            if len(parts) > 1 and parts[0][0:2] != b"--":
+                match = rx.search(parts[1])
+                if match:
+                    key = match.group(1)
+                    value = b"".join(parts[3 + parts[2:].index(b""):])
+                    r.append((key, value))
+        return r
+    return []
diff --git a/netlib/http/request.py b/netlib/http/request.py
index fa8d54aa5..2fcea67dc 100644
--- a/netlib/http/request.py
+++ b/netlib/http/request.py
@@ -6,7 +6,9 @@ import six
 from six.moves import urllib
 
 from netlib import utils
-from netlib.http import cookies
+import netlib.http.url
+from netlib.http import multipart
+from . import cookies
 from .. import encoding
 from ..multidict import MultiDictView
 from .headers import Headers
@@ -179,11 +181,11 @@ class Request(Message):
         """
         if self.first_line_format == "authority":
             return "%s:%d" % (self.host, self.port)
-        return utils.unparse_url(self.scheme, self.host, self.port, self.path)
+        return netlib.http.url.unparse(self.scheme, self.host, self.port, self.path)
 
     @url.setter
     def url(self, url):
-        self.scheme, self.host, self.port, self.path = utils.parse_url(url)
+        self.scheme, self.host, self.port, self.path = netlib.http.url.parse(url)
 
     def _parse_host_header(self):
         """Extract the host and port from Host header"""
@@ -219,7 +221,7 @@ class Request(Message):
         """
         if self.first_line_format == "authority":
             return "%s:%d" % (self.pretty_host, self.port)
-        return utils.unparse_url(self.scheme, self.pretty_host, self.port, self.path)
+        return netlib.http.url.unparse(self.scheme, self.pretty_host, self.port, self.path)
 
     @property
     def query(self):
@@ -234,12 +236,12 @@ class Request(Message):
 
     def _get_query(self):
         _, _, _, _, query, _ = urllib.parse.urlparse(self.url)
-        return tuple(utils.urldecode(query))
+        return tuple(netlib.http.url.decode(query))
 
     def _set_query(self, value):
-        query = utils.urlencode(value)
+        query = netlib.http.url.encode(value)
         scheme, netloc, path, params, _, fragment = urllib.parse.urlparse(self.url)
-        _, _, _, self.path = utils.parse_url(
+        _, _, _, self.path = netlib.http.url.parse(
             urllib.parse.urlunparse([scheme, netloc, path, params, query, fragment]))
 
     @query.setter
@@ -287,7 +289,7 @@ class Request(Message):
         components = map(lambda x: urllib.parse.quote(x, safe=""), components)
         path = "/" + "/".join(components)
         scheme, netloc, _, params, query, fragment = urllib.parse.urlparse(self.url)
-        _, _, _, self.path = utils.parse_url(
+        _, _, _, self.path = netlib.http.url.parse(
             urllib.parse.urlunparse([scheme, netloc, path, params, query, fragment]))
 
     def anticache(self):
@@ -339,7 +341,7 @@ class Request(Message):
     def _get_urlencoded_form(self):
         is_valid_content_type = "application/x-www-form-urlencoded" in self.headers.get("content-type", "").lower()
         if is_valid_content_type:
-            return tuple(utils.urldecode(self.content))
+            return tuple(netlib.http.url.decode(self.content))
         return ()
 
     def _set_urlencoded_form(self, value):
@@ -348,7 +350,7 @@ class Request(Message):
         This will overwrite the existing content if there is one.
         """
         self.headers["content-type"] = "application/x-www-form-urlencoded"
-        self.content = utils.urlencode(value)
+        self.content = netlib.http.url.encode(value)
 
     @urlencoded_form.setter
     def urlencoded_form(self, value):
@@ -368,7 +370,7 @@ class Request(Message):
     def _get_multipart_form(self):
         is_valid_content_type = "multipart/form-data" in self.headers.get("content-type", "").lower()
         if is_valid_content_type:
-            return utils.multipartdecode(self.headers, self.content)
+            return multipart.decode(self.headers, self.content)
         return ()
 
     def _set_multipart_form(self, value):
diff --git a/netlib/http/response.py b/netlib/http/response.py
index a6a5bf474..858b3aea6 100644
--- a/netlib/http/response.py
+++ b/netlib/http/response.py
@@ -7,7 +7,7 @@ from . import cookies
 from .headers import Headers
 from .message import Message, _native, _always_bytes, MessageData
 from ..multidict import MultiDictView
-from .. import utils
+from .. import human
 
 
 class ResponseData(MessageData):
@@ -36,7 +36,7 @@ class Response(Message):
         if self.content:
             details = "{}, {}".format(
                 self.headers.get("content-type", "unknown content type"),
-                utils.pretty_size(len(self.content))
+                human.pretty_size(len(self.content))
             )
         else:
             details = "no content"
diff --git a/netlib/http/url.py b/netlib/http/url.py
new file mode 100644
index 000000000..8ce28578b
--- /dev/null
+++ b/netlib/http/url.py
@@ -0,0 +1,96 @@
+import six
+from six.moves import urllib
+
+from .. import utils
+
+
+# PY2 workaround
+def decode_parse_result(result, enc):
+    if hasattr(result, "decode"):
+        return result.decode(enc)
+    else:
+        return urllib.parse.ParseResult(*[x.decode(enc) for x in result])
+
+
+# PY2 workaround
+def encode_parse_result(result, enc):
+    if hasattr(result, "encode"):
+        return result.encode(enc)
+    else:
+        return urllib.parse.ParseResult(*[x.encode(enc) for x in result])
+
+
+def parse(url):
+    """
+        URL-parsing function that checks that
+            - port is an integer 0-65535
+            - host is a valid IDNA-encoded hostname with no null-bytes
+            - path is valid ASCII
+
+        Args:
+            A URL (as bytes or as unicode)
+
+        Returns:
+            A (scheme, host, port, path) tuple
+
+        Raises:
+            ValueError, if the URL is not properly formatted.
+    """
+    parsed = urllib.parse.urlparse(url)
+
+    if not parsed.hostname:
+        raise ValueError("No hostname given")
+
+    if isinstance(url, six.binary_type):
+        host = parsed.hostname
+
+        # this should not raise a ValueError,
+        # but we try to be very forgiving here and accept just everything.
+        # decode_parse_result(parsed, "ascii")
+    else:
+        host = parsed.hostname.encode("idna")
+        parsed = encode_parse_result(parsed, "ascii")
+
+    port = parsed.port
+    if not port:
+        port = 443 if parsed.scheme == b"https" else 80
+
+    full_path = urllib.parse.urlunparse(
+        (b"", b"", parsed.path, parsed.params, parsed.query, parsed.fragment)
+    )
+    if not full_path.startswith(b"/"):
+        full_path = b"/" + full_path
+
+    if not utils.is_valid_host(host):
+        raise ValueError("Invalid Host")
+    if not utils.is_valid_port(port):
+        raise ValueError("Invalid Port")
+
+    return parsed.scheme, host, port, full_path
+
+
+def unparse(scheme, host, port, path=""):
+    """
+    Returns a URL string, constructed from the specified components.
+
+    Args:
+        All args must be str.
+    """
+    if path == "*":
+        path = ""
+    return "%s://%s%s" % (scheme, utils.hostport(scheme, host, port), path)
+
+
+def encode(s):
+    """
+        Takes a list of (key, value) tuples and returns a urlencoded string.
+    """
+    s = [tuple(i) for i in s]
+    return urllib.parse.urlencode(s, False)
+
+
+def decode(s):
+    """
+        Takes a urlencoded string and returns a list of (key, value) tuples.
+    """
+    return urllib.parse.parse_qsl(s, keep_blank_values=True)
diff --git a/netlib/human.py b/netlib/human.py
new file mode 100644
index 000000000..a007adc78
--- /dev/null
+++ b/netlib/human.py
@@ -0,0 +1,50 @@
+
+SIZE_TABLE = [
+    ("b", 1024 ** 0),
+    ("k", 1024 ** 1),
+    ("m", 1024 ** 2),
+    ("g", 1024 ** 3),
+    ("t", 1024 ** 4),
+]
+
+SIZE_UNITS = dict(SIZE_TABLE)
+
+
+def pretty_size(size):
+    for bottom, top in zip(SIZE_TABLE, SIZE_TABLE[1:]):
+        if bottom[1] <= size < top[1]:
+            suf = bottom[0]
+            lim = bottom[1]
+            x = round(size / lim, 2)
+            if x == int(x):
+                x = int(x)
+            return str(x) + suf
+    return "%s%s" % (size, SIZE_TABLE[0][0])
+
+
+def parse_size(s):
+    try:
+        return int(s)
+    except ValueError:
+        pass
+    for i in SIZE_UNITS.keys():
+        if s.endswith(i):
+            try:
+                return int(s[:-1]) * SIZE_UNITS[i]
+            except ValueError:
+                break
+    raise ValueError("Invalid size specification.")
+
+
+def pretty_duration(secs):
+    formatters = [
+        (100, "{:.0f}s"),
+        (10, "{:2.1f}s"),
+        (1, "{:1.2f}s"),
+    ]
+
+    for limit, formatter in formatters:
+        if secs >= limit:
+            return formatter.format(secs)
+    # less than 1 sec
+    return "{:.0f}ms".format(secs * 1000)
diff --git a/netlib/multidict.py b/netlib/multidict.py
index 98fde7e33..6139d60ad 100644
--- a/netlib/multidict.py
+++ b/netlib/multidict.py
@@ -9,12 +9,11 @@ except ImportError:  # pragma: no cover
     from collections import MutableMapping  # Workaround for Python < 3.3
 
 import six
-
-from .utils import Serializable
+from . import basetypes
 
 
 @six.add_metaclass(ABCMeta)
-class _MultiDict(MutableMapping, Serializable):
+class _MultiDict(MutableMapping, basetypes.Serializable):
     def __repr__(self):
         fields = (
             repr(field)
@@ -171,6 +170,14 @@ class _MultiDict(MutableMapping, Serializable):
         else:
             return super(_MultiDict, self).items()
 
+    def clear(self, key):
+        """
+            Removes all items with the specified key, and does not raise an
+            exception if the key does not exist.
+        """
+        if key in self:
+            del self[key]
+
     def to_dict(self):
         """
         Get the MultiDict as a plain Python dict.
diff --git a/netlib/odict.py b/netlib/odict.py
index 8a638dabc..87887a294 100644
--- a/netlib/odict.py
+++ b/netlib/odict.py
@@ -3,10 +3,10 @@ import copy
 
 import six
 
-from .utils import Serializable, safe_subn
+from . import basetypes, utils
 
 
-class ODict(Serializable):
+class ODict(basetypes.Serializable):
 
     """
         A dictionary-like object for managing ordered (key, value) data. Think
@@ -139,9 +139,9 @@ class ODict(Serializable):
         """
         new, count = [], 0
         for k, v in self.lst:
-            k, c = safe_subn(pattern, repl, k, *args, **kwargs)
+            k, c = utils.safe_subn(pattern, repl, k, *args, **kwargs)
             count += c
-            v, c = safe_subn(pattern, repl, v, *args, **kwargs)
+            v, c = utils.safe_subn(pattern, repl, v, *args, **kwargs)
             count += c
             new.append([k, v])
         self.lst = new
diff --git a/netlib/tcp.py b/netlib/tcp.py
index c7231dbb6..5662c9737 100644
--- a/netlib/tcp.py
+++ b/netlib/tcp.py
@@ -16,7 +16,7 @@ import six
 import OpenSSL
 from OpenSSL import SSL
 
-from . import certutils, version_check, utils
+from . import certutils, version_check, basetypes
 
 # This is a rather hackish way to make sure that
 # the latest version of pyOpenSSL is actually installed.
@@ -302,7 +302,7 @@ class Reader(_FileLike):
             raise NotImplementedError("Can only peek into (pyOpenSSL) sockets")
 
 
-class Address(utils.Serializable):
+class Address(basetypes.Serializable):
 
     """
         This class wraps an IPv4/IPv6 tuple to provide named attributes and
diff --git a/netlib/utils.py b/netlib/utils.py
index 174f616de..b8408d1d0 100644
--- a/netlib/utils.py
+++ b/netlib/utils.py
@@ -3,47 +3,11 @@ import os.path
 import re
 import codecs
 import unicodedata
-from abc import ABCMeta, abstractmethod
 import importlib
 import inspect
 
 import six
 
-from six.moves import urllib
-import hyperframe
-
-
-@six.add_metaclass(ABCMeta)
-class Serializable(object):
-    """
-    Abstract Base Class that defines an API to save an object's state and restore it later on.
-    """
-
-    @classmethod
-    @abstractmethod
-    def from_state(cls, state):
-        """
-        Create a new object from the given state.
-        """
-        raise NotImplementedError()
-
-    @abstractmethod
-    def get_state(self):
-        """
-        Retrieve object state.
-        """
-        raise NotImplementedError()
-
-    @abstractmethod
-    def set_state(self, state):
-        """
-        Set object state to the given state.
-        """
-        raise NotImplementedError()
-
-    def copy(self):
-        return self.from_state(self.get_state())
-
 
 def always_bytes(unicode_or_bytes, *encode_args):
     if isinstance(unicode_or_bytes, six.text_type):
@@ -69,14 +33,6 @@ def native(s, *encoding_opts):
     return s
 
 
-def isascii(bytes):
-    try:
-        bytes.decode("ascii")
-    except ValueError:
-        return False
-    return True
-
-
 def clean_bin(s, keep_spacing=True):
     """
         Cleans binary data to make it safe to display.
@@ -161,22 +117,6 @@ class BiDi(object):
         return self.values.get(n, default)
 
 
-def pretty_size(size):
-    suffixes = [
-        ("B", 2 ** 10),
-        ("kB", 2 ** 20),
-        ("MB", 2 ** 30),
-    ]
-    for suf, lim in suffixes:
-        if size >= lim:
-            continue
-        else:
-            x = round(size / float(lim / 2 ** 10), 2)
-            if x == int(x):
-                x = int(x)
-            return str(x) + suf
-
-
 class Data(object):
 
     def __init__(self, name):
@@ -222,83 +162,6 @@ def is_valid_port(port):
     return 0 <= port <= 65535
 
 
-# PY2 workaround
-def decode_parse_result(result, enc):
-    if hasattr(result, "decode"):
-        return result.decode(enc)
-    else:
-        return urllib.parse.ParseResult(*[x.decode(enc) for x in result])
-
-
-# PY2 workaround
-def encode_parse_result(result, enc):
-    if hasattr(result, "encode"):
-        return result.encode(enc)
-    else:
-        return urllib.parse.ParseResult(*[x.encode(enc) for x in result])
-
-
-def parse_url(url):
-    """
-        URL-parsing function that checks that
-            - port is an integer 0-65535
-            - host is a valid IDNA-encoded hostname with no null-bytes
-            - path is valid ASCII
-
-        Args:
-            A URL (as bytes or as unicode)
-
-        Returns:
-            A (scheme, host, port, path) tuple
-
-        Raises:
-            ValueError, if the URL is not properly formatted.
-    """
-    parsed = urllib.parse.urlparse(url)
-
-    if not parsed.hostname:
-        raise ValueError("No hostname given")
-
-    if isinstance(url, six.binary_type):
-        host = parsed.hostname
-
-        # this should not raise a ValueError,
-        # but we try to be very forgiving here and accept just everything.
-        # decode_parse_result(parsed, "ascii")
-    else:
-        host = parsed.hostname.encode("idna")
-        parsed = encode_parse_result(parsed, "ascii")
-
-    port = parsed.port
-    if not port:
-        port = 443 if parsed.scheme == b"https" else 80
-
-    full_path = urllib.parse.urlunparse(
-        (b"", b"", parsed.path, parsed.params, parsed.query, parsed.fragment)
-    )
-    if not full_path.startswith(b"/"):
-        full_path = b"/" + full_path
-
-    if not is_valid_host(host):
-        raise ValueError("Invalid Host")
-    if not is_valid_port(port):
-        raise ValueError("Invalid Port")
-
-    return parsed.scheme, host, port, full_path
-
-
-def get_header_tokens(headers, key):
-    """
-        Retrieve all tokens for a header key. A number of different headers
-        follow a pattern where each header line can containe comma-separated
-        tokens, and headers can be set multiple times.
-    """
-    if key not in headers:
-        return []
-    tokens = headers[key].split(",")
-    return [token.strip() for token in tokens]
-
-
 def hostport(scheme, host, port):
     """
         Returns the host component, with a port specifcation if needed.
@@ -312,107 +175,6 @@ def hostport(scheme, host, port):
             return "%s:%d" % (host, port)
 
 
-def unparse_url(scheme, host, port, path=""):
-    """
-    Returns a URL string, constructed from the specified components.
-
-    Args:
-        All args must be str.
-    """
-    if path == "*":
-        path = ""
-    return "%s://%s%s" % (scheme, hostport(scheme, host, port), path)
-
-
-def urlencode(s):
-    """
-        Takes a list of (key, value) tuples and returns a urlencoded string.
-    """
-    s = [tuple(i) for i in s]
-    return urllib.parse.urlencode(s, False)
-
-
-def urldecode(s):
-    """
-        Takes a urlencoded string and returns a list of (key, value) tuples.
-    """
-    return urllib.parse.parse_qsl(s, keep_blank_values=True)
-
-
-def parse_content_type(c):
-    """
-        A simple parser for content-type values. Returns a (type, subtype,
-        parameters) tuple, where type and subtype are strings, and parameters
-        is a dict. If the string could not be parsed, return None.
-
-        E.g. the following string:
-
-            text/html; charset=UTF-8
-
-        Returns:
-
-            ("text", "html", {"charset": "UTF-8"})
-    """
-    parts = c.split(";", 1)
-    ts = parts[0].split("/", 1)
-    if len(ts) != 2:
-        return None
-    d = {}
-    if len(parts) == 2:
-        for i in parts[1].split(";"):
-            clause = i.split("=", 1)
-            if len(clause) == 2:
-                d[clause[0].strip()] = clause[1].strip()
-    return ts[0].lower(), ts[1].lower(), d
-
-
-def multipartdecode(headers, content):
-    """
-        Takes a multipart boundary encoded string and returns list of (key, value) tuples.
-    """
-    v = headers.get("content-type")
-    if v:
-        v = parse_content_type(v)
-        if not v:
-            return []
-        try:
-            boundary = v[2]["boundary"].encode("ascii")
-        except (KeyError, UnicodeError):
-            return []
-
-        rx = re.compile(br'\bname="([^"]+)"')
-        r = []
-
-        for i in content.split(b"--" + boundary):
-            parts = i.splitlines()
-            if len(parts) > 1 and parts[0][0:2] != b"--":
-                match = rx.search(parts[1])
-                if match:
-                    key = match.group(1)
-                    value = b"".join(parts[3 + parts[2:].index(b""):])
-                    r.append((key, value))
-        return r
-    return []
-
-
-def http2_read_raw_frame(rfile):
-    header = rfile.safe_read(9)
-    length = int(codecs.encode(header[:3], 'hex_codec'), 16)
-
-    if length == 4740180:
-        raise ValueError("Length field looks more like HTTP/1.1: %s" % rfile.peek(20))
-
-    body = rfile.safe_read(length)
-    return [header, body]
-
-
-def http2_read_frame(rfile):
-    header, body = http2_read_raw_frame(rfile)
-    frame, length = hyperframe.frame.Frame.parse_frame_header(header)
-    frame.parse_body(memoryview(body))
-    return frame
-
-
 def safe_subn(pattern, repl, target, *args, **kwargs):
     """
         There are Unicode conversion problems with re.subn. We try to smooth
diff --git a/netlib/websockets/frame.py b/netlib/websockets/frame.py
index da5a97f3f..cf8917c17 100644
--- a/netlib/websockets/frame.py
+++ b/netlib/websockets/frame.py
@@ -9,6 +9,7 @@ import six
 from .protocol import Masker
 from netlib import tcp
 from netlib import utils
+from netlib import human
 
 
 MAX_16_BIT_INT = (1 << 16)
@@ -98,7 +99,7 @@ class FrameHeader(object):
         if self.masking_key:
             vals.append(":key=%s" % repr(self.masking_key))
         if self.payload_length:
-            vals.append(" %s" % utils.pretty_size(self.payload_length))
+            vals.append(" %s" % human.pretty_size(self.payload_length))
         return "".join(vals)
 
     def human_readable(self):
diff --git a/pathod/language/base.py b/pathod/language/base.py
index 54ca64926..97111ed63 100644
--- a/pathod/language/base.py
+++ b/pathod/language/base.py
@@ -5,8 +5,8 @@ import pyparsing as pp
 
 from six.moves import reduce
 from netlib.utils import escaped_str_to_bytes, bytes_to_escaped_str
+from netlib import human
 
-from .. import utils
 from . import generators, exceptions
 
 
@@ -158,7 +158,7 @@ class TokValueGenerate(Token):
         self.usize, self.unit, self.datatype = usize, unit, datatype
 
     def bytes(self):
-        return self.usize * utils.SIZE_UNITS[self.unit]
+        return self.usize * human.SIZE_UNITS[self.unit]
 
     def get_generator(self, settings_):
         return generators.RandomGenerator(self.datatype, self.bytes())
@@ -173,7 +173,7 @@ class TokValueGenerate(Token):
 
         u = reduce(
             operator.or_,
-            [pp.Literal(i) for i in utils.SIZE_UNITS.keys()]
+            [pp.Literal(i) for i in human.SIZE_UNITS.keys()]
         ).leaveWhitespace()
         e = e + pp.Optional(u, default=None)
 
diff --git a/pathod/pathod_cmdline.py b/pathod/pathod_cmdline.py
index a7cd24957..a4f05fafe 100644
--- a/pathod/pathod_cmdline.py
+++ b/pathod/pathod_cmdline.py
@@ -4,7 +4,7 @@ import os
 import os.path
 import re
 
-from netlib import tcp
+from netlib import tcp, human
 from . import pathod, version, utils
 
 
@@ -205,7 +205,7 @@ def args_pathod(argv, stdout_=sys.stdout, stderr_=sys.stderr):
     sizelimit = None
     if args.sizelimit:
         try:
-            sizelimit = utils.parse_size(args.sizelimit)
+            sizelimit = human.parse_size(args.sizelimit)
         except ValueError as v:
             return parser.error(v)
     args.sizelimit = sizelimit
diff --git a/pathod/utils.py b/pathod/utils.py
index 8c6d62902..fe12f541c 100644
--- a/pathod/utils.py
+++ b/pathod/utils.py
@@ -5,15 +5,6 @@ import netlib.utils
 from netlib.utils import bytes_to_escaped_str
 
 
-SIZE_UNITS = dict(
-    b=1024 ** 0,
-    k=1024 ** 1,
-    m=1024 ** 2,
-    g=1024 ** 3,
-    t=1024 ** 4,
-)
-
-
 class MemBool(object):
 
     """
@@ -28,20 +19,6 @@ class MemBool(object):
         return bool(v)
 
 
-def parse_size(s):
-    try:
-        return int(s)
-    except ValueError:
-        pass
-    for i in SIZE_UNITS.keys():
-        if s.endswith(i):
-            try:
-                return int(s[:-1]) * SIZE_UNITS[i]
-            except ValueError:
-                break
-    raise ValueError("Invalid size specification.")
-
-
 def parse_anchor_spec(s):
     """
         Return a tuple, or None on error.
diff --git a/test/mitmproxy/test_contentview.py b/test/mitmproxy/test_contentview.py
index c00afa5f7..9142bdad2 100644
--- a/test/mitmproxy/test_contentview.py
+++ b/test/mitmproxy/test_contentview.py
@@ -1,8 +1,8 @@
 from mitmproxy.exceptions import ContentViewException
 from netlib.http import Headers
 from netlib.odict import ODict
-import netlib.utils
 from netlib import encoding
+from netlib.http import url
 
 import mitmproxy.contentviews as cv
 from . import tutils
@@ -60,10 +60,10 @@ class TestContentView:
         assert f[0] == "Query"
 
     def test_view_urlencoded(self):
-        d = netlib.utils.urlencode([("one", "two"), ("three", "four")])
+        d = url.encode([("one", "two"), ("three", "four")])
         v = cv.ViewURLEncoded()
         assert v(d)
-        d = netlib.utils.urlencode([("adsfa", "")])
+        d = url.encode([("adsfa", "")])
         v = cv.ViewURLEncoded()
         assert v(d)
 
diff --git a/test/mitmproxy/test_protocol_http2.py b/test/mitmproxy/test_protocol_http2.py
index 4a7620147..23072260c 100644
--- a/test/mitmproxy/test_protocol_http2.py
+++ b/test/mitmproxy/test_protocol_http2.py
@@ -13,7 +13,7 @@ from mitmproxy.cmdline import APP_HOST, APP_PORT
 
 import netlib
 from ..netlib import tservers as netlib_tservers
-from netlib.utils import http2_read_raw_frame
+from netlib.http.http2 import framereader
 
 from . import tservers
 
@@ -48,7 +48,7 @@ class _Http2ServerBase(netlib_tservers.ServerTestBase):
             done = False
             while not done:
                 try:
-                    raw = b''.join(http2_read_raw_frame(self.rfile))
+                    raw = b''.join(framereader.http2_read_raw_frame(self.rfile))
                     events = h2_conn.receive_data(raw)
                 except:
                     break
@@ -200,7 +200,7 @@ class TestSimple(_Http2TestBase, _Http2ServerBase):
         done = False
         while not done:
             try:
-                events = h2_conn.receive_data(b''.join(http2_read_raw_frame(client.rfile)))
+                events = h2_conn.receive_data(b''.join(framereader.http2_read_raw_frame(client.rfile)))
             except:
                 break
             client.wfile.write(h2_conn.data_to_send())
@@ -270,7 +270,7 @@ class TestWithBodies(_Http2TestBase, _Http2ServerBase):
         done = False
         while not done:
             try:
-                events = h2_conn.receive_data(b''.join(http2_read_raw_frame(client.rfile)))
+                events = h2_conn.receive_data(b''.join(framereader.http2_read_raw_frame(client.rfile)))
             except:
                 break
             client.wfile.write(h2_conn.data_to_send())
@@ -362,7 +362,7 @@ class TestPushPromise(_Http2TestBase, _Http2ServerBase):
         responses = 0
         while not done:
             try:
-                raw = b''.join(http2_read_raw_frame(client.rfile))
+                raw = b''.join(framereader.http2_read_raw_frame(client.rfile))
                 events = h2_conn.receive_data(raw)
             except:
                 break
@@ -412,7 +412,7 @@ class TestPushPromise(_Http2TestBase, _Http2ServerBase):
         responses = 0
         while not done:
             try:
-                events = h2_conn.receive_data(b''.join(http2_read_raw_frame(client.rfile)))
+                events = h2_conn.receive_data(b''.join(framereader.http2_read_raw_frame(client.rfile)))
             except:
                 break
             client.wfile.write(h2_conn.data_to_send())
@@ -479,7 +479,7 @@ class TestConnectionLost(_Http2TestBase, _Http2ServerBase):
         done = False
         while not done:
             try:
-                raw = b''.join(http2_read_raw_frame(client.rfile))
+                raw = b''.join(framereader.http2_read_raw_frame(client.rfile))
                 h2_conn.receive_data(raw)
             except:
                 break
diff --git a/test/mitmproxy/test_utils.py b/test/mitmproxy/test_utils.py
index db7dec4ab..2af7a3325 100644
--- a/test/mitmproxy/test_utils.py
+++ b/test/mitmproxy/test_utils.py
@@ -43,21 +43,6 @@ def test_pretty_json():
     assert not utils.pretty_json("moo")
 
 
-def test_pretty_duration():
-    assert utils.pretty_duration(0.00001) == "0ms"
-    assert utils.pretty_duration(0.0001) == "0ms"
-    assert utils.pretty_duration(0.001) == "1ms"
-    assert utils.pretty_duration(0.01) == "10ms"
-    assert utils.pretty_duration(0.1) == "100ms"
-    assert utils.pretty_duration(1) == "1.00s"
-    assert utils.pretty_duration(10) == "10.0s"
-    assert utils.pretty_duration(100) == "100s"
-    assert utils.pretty_duration(1000) == "1000s"
-    assert utils.pretty_duration(10000) == "10000s"
-    assert utils.pretty_duration(1.123) == "1.12s"
-    assert utils.pretty_duration(0.123) == "123ms"
-
-
 def test_LRUCache():
     cache = utils.LRUCache(2)
 
@@ -89,13 +74,3 @@ def test_LRUCache():
 
     assert len(cache.cacheList) == 2
     assert len(cache.cache) == 2
-
-
-def test_parse_size():
-    assert not utils.parse_size("")
-    assert utils.parse_size("1") == 1
-    assert utils.parse_size("1k") == 1024
-    assert utils.parse_size("1m") == 1024**2
-    assert utils.parse_size("1g") == 1024**3
-    tutils.raises(ValueError, utils.parse_size, "1f")
-    tutils.raises(ValueError, utils.parse_size, "ak")
diff --git a/test/netlib/http/http1/test_read.py b/test/netlib/http/http1/test_read.py
index 974aa8956..5285ac1d2 100644
--- a/test/netlib/http/http1/test_read.py
+++ b/test/netlib/http/http1/test_read.py
@@ -7,11 +7,22 @@ from netlib.http.http1.read import (
     read_request, read_response, read_request_head,
     read_response_head, read_body, connection_close, expected_http_body_size, _get_first_line,
     _read_request_line, _parse_authority_form, _read_response_line, _check_http_version,
-    _read_headers, _read_chunked
+    _read_headers, _read_chunked, get_header_tokens
 )
 from netlib.tutils import treq, tresp, raises
 
 
+def test_get_header_tokens():
+    headers = Headers()
+    assert get_header_tokens(headers, "foo") == []
+    headers["foo"] = "bar"
+    assert get_header_tokens(headers, "foo") == ["bar"]
+    headers["foo"] = "bar, voing"
+    assert get_header_tokens(headers, "foo") == ["bar", "voing"]
+    headers.set_all("foo", ["bar, voing", "oink"])
+    assert get_header_tokens(headers, "foo") == ["bar", "voing", "oink"]
+
+
 def test_read_request():
     rfile = BytesIO(b"GET / HTTP/1.1\r\n\r\nskip")
     r = read_request(rfile)
diff --git a/test/netlib/http/http2/test_connections.py b/test/netlib/http/http2/test_connections.py
index ff462ba64..27cc30bac 100644
--- a/test/netlib/http/http2/test_connections.py
+++ b/test/netlib/http/http2/test_connections.py
@@ -1,12 +1,12 @@
 import mock
 import codecs
 
-from hyperframe import frame
-
-from netlib import tcp, http, utils
+import hyperframe
+from netlib import tcp, http
 from netlib.tutils import raises
 from netlib.exceptions import TcpDisconnect
 from netlib.http.http2.connections import HTTP2Protocol, TCPHandler
+from netlib.http.http2 import framereader
 
 from ... import tservers
 
@@ -111,11 +111,11 @@ class TestPerformServerConnectionPreface(tservers.ServerTestBase):
             self.wfile.flush()
 
             # check empty settings frame
-            raw = utils.http2_read_raw_frame(self.rfile)
+            raw = framereader.http2_read_raw_frame(self.rfile)
             assert raw == codecs.decode('00000c040000000000000200000000000300000001', 'hex_codec')
 
             # check settings acknowledgement
-            raw = utils.http2_read_raw_frame(self.rfile)
+            raw = framereader.http2_read_raw_frame(self.rfile)
             assert raw == codecs.decode('000000040100000000', 'hex_codec')
 
             # send settings acknowledgement
@@ -214,19 +214,19 @@ class TestApplySettings(tservers.ServerTestBase):
         protocol = HTTP2Protocol(c)
 
         protocol._apply_settings({
-            frame.SettingsFrame.ENABLE_PUSH: 'foo',
-            frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 'bar',
-            frame.SettingsFrame.INITIAL_WINDOW_SIZE: 'deadbeef',
+            hyperframe.frame.SettingsFrame.ENABLE_PUSH: 'foo',
+            hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 'bar',
+            hyperframe.frame.SettingsFrame.INITIAL_WINDOW_SIZE: 'deadbeef',
         })
 
         assert c.rfile.safe_read(2) == b"OK"
 
         assert protocol.http2_settings[
-            frame.SettingsFrame.ENABLE_PUSH] == 'foo'
+            hyperframe.frame.SettingsFrame.ENABLE_PUSH] == 'foo'
         assert protocol.http2_settings[
-            frame.SettingsFrame.MAX_CONCURRENT_STREAMS] == 'bar'
+            hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS] == 'bar'
         assert protocol.http2_settings[
-            frame.SettingsFrame.INITIAL_WINDOW_SIZE] == 'deadbeef'
+            hyperframe.frame.SettingsFrame.INITIAL_WINDOW_SIZE] == 'deadbeef'
 
 
 class TestCreateHeaders(object):
@@ -258,7 +258,7 @@ class TestCreateHeaders(object):
             (b'server', b'version')])
 
         protocol = HTTP2Protocol(self.c)
-        protocol.http2_settings[frame.SettingsFrame.MAX_FRAME_SIZE] = 8
+        protocol.http2_settings[hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE] = 8
         bytes = protocol._create_headers(headers, 1, end_stream=True)
         assert len(bytes) == 3
         assert bytes[0] == codecs.decode('000008010100000001828487408294e783', 'hex_codec')
@@ -281,7 +281,7 @@ class TestCreateBody(object):
 
     def test_create_body_multiple_frames(self):
         protocol = HTTP2Protocol(self.c)
-        protocol.http2_settings[frame.SettingsFrame.MAX_FRAME_SIZE] = 5
+        protocol.http2_settings[hyperframe.frame.SettingsFrame.MAX_FRAME_SIZE] = 5
         bytes = protocol._create_body(b'foobarmehm42', 1)
         assert len(bytes) == 3
         assert bytes[0] == codecs.decode('000005000000000001666f6f6261', 'hex_codec')
@@ -312,7 +312,10 @@ class TestReadRequest(tservers.ServerTestBase):
         req = protocol.read_request(NotImplemented)
 
         assert req.stream_id
-        assert req.headers.fields == ((b':method', b'GET'), (b':path', b'/'), (b':scheme', b'https'))
+        assert req.headers.fields == ()
+        assert req.method == "GET"
+        assert req.path == "/"
+        assert req.scheme == "https"
         assert req.content == b'foobar'
 
 
diff --git a/test/netlib/http/test_headers.py b/test/netlib/http/test_headers.py
index cd2ca9d11..e12bceaf2 100644
--- a/test/netlib/http/test_headers.py
+++ b/test/netlib/http/test_headers.py
@@ -1,4 +1,5 @@
 from netlib.http import Headers
+from netlib.http.headers import parse_content_type
 from netlib.tutils import raises
 
 
@@ -72,3 +73,12 @@ class TestHeaders(object):
         replacements = headers.replace(r"Host: ", "X-Host ")
         assert replacements == 0
         assert headers["Host"] == "example.com"
+
+
+def test_parse_content_type():
+    p = parse_content_type
+    assert p("text/html") == ("text", "html", {})
+    assert p("text") is None
+
+    v = p("text/html; charset=UTF-8")
+    assert v == ('text', 'html', {'charset': 'UTF-8'})
diff --git a/test/netlib/http/test_multipart.py b/test/netlib/http/test_multipart.py
new file mode 100644
index 000000000..1d7e00620
--- /dev/null
+++ b/test/netlib/http/test_multipart.py
@@ -0,0 +1,24 @@
+from netlib.http import Headers
+from netlib.http import multipart
+
+
+def test_decode():
+    boundary = 'somefancyboundary'
+    headers = Headers(
+        content_type='multipart/form-data; boundary=' + boundary
+    )
+    content = (
+        "--{0}\n"
+        "Content-Disposition: form-data; name=\"field1\"\n\n"
+        "value1\n"
+        "--{0}\n"
+        "Content-Disposition: form-data; name=\"field2\"\n\n"
+        "value2\n"
+        "--{0}--".format(boundary).encode()
+    )
+
+    form = multipart.decode(headers, content)
+
+    assert len(form) == 2
+    assert form[0] == (b"field1", b"value1")
+    assert form[1] == (b"field2", b"value2")
diff --git a/test/netlib/http/test_response.py b/test/netlib/http/test_response.py
index 1faef7ece..b3c2f7364 100644
--- a/test/netlib/http/test_response.py
+++ b/test/netlib/http/test_response.py
@@ -24,7 +24,7 @@ class TestResponseCore(object):
     """
     def test_repr(self):
         response = tresp()
-        assert repr(response) == "Response(200 OK, unknown content type, 7B)"
+        assert repr(response) == "Response(200 OK, unknown content type, 7b)"
         response.content = None
         assert repr(response) == "Response(200 OK, no content)"
 
diff --git a/test/netlib/http/test_url.py b/test/netlib/http/test_url.py
new file mode 100644
index 000000000..26b37230e
--- /dev/null
+++ b/test/netlib/http/test_url.py
@@ -0,0 +1,66 @@
+from netlib import tutils
+from netlib.http import url
+
+
+def test_parse():
+    with tutils.raises(ValueError):
+        url.parse("")
+
+    s, h, po, pa = url.parse(b"http://foo.com:8888/test")
+    assert s == b"http"
+    assert h == b"foo.com"
+    assert po == 8888
+    assert pa == b"/test"
+
+    s, h, po, pa = url.parse("http://foo/bar")
+    assert s == b"http"
+    assert h == b"foo"
+    assert po == 80
+    assert pa == b"/bar"
+
+    s, h, po, pa = url.parse(b"http://user:pass@foo/bar")
+    assert s == b"http"
+    assert h == b"foo"
+    assert po == 80
+    assert pa == b"/bar"
+
+    s, h, po, pa = url.parse(b"http://foo")
+    assert pa == b"/"
+
+    s, h, po, pa = url.parse(b"https://foo")
+    assert po == 443
+
+    with tutils.raises(ValueError):
+        url.parse(b"https://foo:bar")
+
+    # Invalid IDNA
+    with tutils.raises(ValueError):
+        url.parse("http://\xfafoo")
+    # Invalid PATH
+    with tutils.raises(ValueError):
+        url.parse("http:/\xc6/localhost:56121")
+    # Null byte in host
+    with tutils.raises(ValueError):
+        url.parse("http://foo\0")
+    # Port out of range
+    _, _, port, _ = url.parse("http://foo:999999")
+    assert port == 80
+    # Invalid IPv6 URL - see http://www.ietf.org/rfc/rfc2732.txt
+    with tutils.raises(ValueError):
+        url.parse('http://lo[calhost')
+
+
+def test_unparse():
+    assert url.unparse("http", "foo.com", 99, "") == "http://foo.com:99"
+    assert url.unparse("http", "foo.com", 80, "/bar") == "http://foo.com/bar"
+    assert url.unparse("https", "foo.com", 80, "") == "https://foo.com:80"
+    assert url.unparse("https", "foo.com", 443, "") == "https://foo.com"
+
+
+def test_urlencode():
+    assert url.encode([('foo', 'bar')])
+
+
+def test_urldecode():
+    s = "one=two&three=four"
+    assert len(url.decode(s)) == 2
diff --git a/test/netlib/test_basetypes.py b/test/netlib/test_basetypes.py
new file mode 100644
index 000000000..aa4157849
--- /dev/null
+++ b/test/netlib/test_basetypes.py
@@ -0,0 +1,28 @@
+from netlib import basetypes
+
+
+class SerializableDummy(basetypes.Serializable):
+    def __init__(self, i):
+        self.i = i
+
+    def get_state(self):
+        return self.i
+
+    def set_state(self, i):
+        self.i = i
+
+    def from_state(self, state):
+        return type(self)(state)
+
+
+class TestSerializable:
+
+    def test_copy(self):
+        a = SerializableDummy(42)
+        assert a.i == 42
+        b = a.copy()
+        assert b.i == 42
+
+        a.set_state(1)
+        assert a.i == 1
+        assert b.i == 42
diff --git a/test/netlib/test_human.py b/test/netlib/test_human.py
new file mode 100644
index 000000000..2a5c2a854
--- /dev/null
+++ b/test/netlib/test_human.py
@@ -0,0 +1,36 @@
+from netlib import human, tutils
+
+
+def test_parse_size():
+    assert human.parse_size("0") == 0
+    assert human.parse_size("0b") == 0
+    assert human.parse_size("1") == 1
+    assert human.parse_size("1k") == 1024
+    assert human.parse_size("1m") == 1024**2
+    assert human.parse_size("1g") == 1024**3
+    tutils.raises(ValueError, human.parse_size, "1f")
+    tutils.raises(ValueError, human.parse_size, "ak")
+
+
+def test_pretty_size():
+    assert human.pretty_size(0) == "0b"
+    assert human.pretty_size(100) == "100b"
+    assert human.pretty_size(1024) == "1k"
+    assert human.pretty_size(1024 + (1024 / 2.0)) == "1.5k"
+    assert human.pretty_size(1024 * 1024) == "1m"
+    assert human.pretty_size(10 * 1024 * 1024) == "10m"
+
+
+def test_pretty_duration():
+    assert human.pretty_duration(0.00001) == "0ms"
+    assert human.pretty_duration(0.0001) == "0ms"
+    assert human.pretty_duration(0.001) == "1ms"
+    assert human.pretty_duration(0.01) == "10ms"
+    assert human.pretty_duration(0.1) == "100ms"
+    assert human.pretty_duration(1) == "1.00s"
+    assert human.pretty_duration(10) == "10.0s"
+    assert human.pretty_duration(100) == "100s"
+    assert human.pretty_duration(1000) == "1000s"
+    assert human.pretty_duration(10000) == "10000s"
+    assert human.pretty_duration(1.123) == "1.12s"
+    assert human.pretty_duration(0.123) == "123ms"
diff --git a/test/netlib/test_utils.py b/test/netlib/test_utils.py
index e4c81a482..e13029cbd 100644
--- a/test/netlib/test_utils.py
+++ b/test/netlib/test_utils.py
@@ -1,7 +1,6 @@
 # coding=utf-8
 
 from netlib import utils, tutils
-from netlib.http import Headers
 
 
 def test_bidi():
@@ -31,146 +30,6 @@ def test_clean_bin():
     assert utils.clean_bin(u"\u2605") == u"\u2605"
 
 
-def test_pretty_size():
-    assert utils.pretty_size(100) == "100B"
-    assert utils.pretty_size(1024) == "1kB"
-    assert utils.pretty_size(1024 + (1024 / 2.0)) == "1.5kB"
-    assert utils.pretty_size(1024 * 1024) == "1MB"
-
-
-def test_parse_url():
-    with tutils.raises(ValueError):
-        utils.parse_url("")
-
-    s, h, po, pa = utils.parse_url(b"http://foo.com:8888/test")
-    assert s == b"http"
-    assert h == b"foo.com"
-    assert po == 8888
-    assert pa == b"/test"
-
-    s, h, po, pa = utils.parse_url("http://foo/bar")
-    assert s == b"http"
-    assert h == b"foo"
-    assert po == 80
-    assert pa == b"/bar"
-
-    s, h, po, pa = utils.parse_url(b"http://user:pass@foo/bar")
-    assert s == b"http"
-    assert h == b"foo"
-    assert po == 80
-    assert pa == b"/bar"
-
-    s, h, po, pa = utils.parse_url(b"http://foo")
-    assert pa == b"/"
-
-    s, h, po, pa = utils.parse_url(b"https://foo")
-    assert po == 443
-
-    with tutils.raises(ValueError):
-        utils.parse_url(b"https://foo:bar")
-
-    # Invalid IDNA
-    with tutils.raises(ValueError):
-        utils.parse_url("http://\xfafoo")
-    # Invalid PATH
-    with tutils.raises(ValueError):
-        utils.parse_url("http:/\xc6/localhost:56121")
-    # Null byte in host
-    with tutils.raises(ValueError):
-        utils.parse_url("http://foo\0")
-    # Port out of range
-    _, _, port, _ = utils.parse_url("http://foo:999999")
-    assert port == 80
-    # Invalid IPv6 URL - see http://www.ietf.org/rfc/rfc2732.txt
-    with tutils.raises(ValueError):
-        utils.parse_url('http://lo[calhost')
-
-
-def test_unparse_url():
-    assert utils.unparse_url("http", "foo.com", 99, "") == "http://foo.com:99"
-    assert utils.unparse_url("http", "foo.com", 80, "/bar") == "http://foo.com/bar"
-    assert utils.unparse_url("https", "foo.com", 80, "") == "https://foo.com:80"
-    assert utils.unparse_url("https", "foo.com", 443, "") == "https://foo.com"
-
-
-def test_urlencode():
-    assert utils.urlencode([('foo', 'bar')])
-
-
-def test_urldecode():
-    s = "one=two&three=four"
-    assert len(utils.urldecode(s)) == 2
-
-
-def test_get_header_tokens():
-    headers = Headers()
-    assert utils.get_header_tokens(headers, "foo") == []
-    headers["foo"] = "bar"
-    assert utils.get_header_tokens(headers, "foo") == ["bar"]
-    headers["foo"] = "bar, voing"
-    assert utils.get_header_tokens(headers, "foo") == ["bar", "voing"]
-    headers.set_all("foo", ["bar, voing", "oink"])
-    assert utils.get_header_tokens(headers, "foo") == ["bar", "voing", "oink"]
-
-
-def test_multipartdecode():
-    boundary = 'somefancyboundary'
-    headers = Headers(
-        content_type='multipart/form-data; boundary=' + boundary
-    )
-    content = (
-        "--{0}\n"
-        "Content-Disposition: form-data; name=\"field1\"\n\n"
-        "value1\n"
-        "--{0}\n"
-        "Content-Disposition: form-data; name=\"field2\"\n\n"
-        "value2\n"
-        "--{0}--".format(boundary).encode()
-    )
-
-    form = utils.multipartdecode(headers, content)
-
-    assert len(form) == 2
-    assert form[0] == (b"field1", b"value1")
-    assert form[1] == (b"field2", b"value2")
-
-
-def test_parse_content_type():
-    p = utils.parse_content_type
-    assert p("text/html") == ("text", "html", {})
-    assert p("text") is None
-
-    v = p("text/html; charset=UTF-8")
-    assert v == ('text', 'html', {'charset': 'UTF-8'})
-
-
-class SerializableDummy(utils.Serializable):
-    def __init__(self, i):
-        self.i = i
-
-    def get_state(self):
-        return self.i
-
-    def set_state(self, i):
-        self.i = i
-
-    def from_state(self, state):
-        return type(self)(state)
-
-
-class TestSerializable:
-
-    def test_copy(self):
-        a = SerializableDummy(42)
-        assert a.i == 42
-        b = a.copy()
-        assert b.i == 42
-
-        a.set_state(1)
-        assert a.i == 1
-        assert b.i == 42
-
-
 def test_safe_subn():
     assert utils.safe_subn("foo", u"bar", "\xc2foo")
 
diff --git a/test/pathod/test_utils.py b/test/pathod/test_utils.py
index 8026a5762..ab4abbaeb 100644
--- a/test/pathod/test_utils.py
+++ b/test/pathod/test_utils.py
@@ -13,13 +13,6 @@ def test_membool():
     assert m.v == 2
 
 
-def test_parse_size():
-    assert utils.parse_size("100") == 100
-    assert utils.parse_size("100k") == 100 * 1024
-    tutils.raises("invalid size spec", utils.parse_size, "foo")
-    tutils.raises("invalid size spec", utils.parse_size, "100kk")
-
-
 def test_parse_anchor_spec():
     assert utils.parse_anchor_spec("foo=200") == ("foo", "200")
     assert utils.parse_anchor_spec("foo") is None