diff --git a/mitmproxy/addons/proxyauth.py b/mitmproxy/addons/proxyauth.py
index e5e4f42f9..b10f4eed2 100644
--- a/mitmproxy/addons/proxyauth.py
+++ b/mitmproxy/addons/proxyauth.py
@@ -1,18 +1,18 @@
 import binascii
 import weakref
-import ldap3
+from typing import MutableMapping
 from typing import Optional
-from typing import MutableMapping  # noqa
 from typing import Tuple
 
+import ldap3
 import passlib.apache
 
 import mitmproxy.net.http
-from mitmproxy import connections  # noqa
+from mitmproxy import ctx
 from mitmproxy import exceptions
 from mitmproxy import http
-from mitmproxy import ctx
 from mitmproxy.net.http import status_codes
+from mitmproxy.utils import compat
 
 REALM = "mitmproxy"
 
@@ -49,7 +49,7 @@ class ProxyAuth:
         self.singleuser = None
         self.ldapconn = None
         self.ldapserver = None
-        self.authenticated: MutableMapping[connections.ClientConnection, Tuple[str, str]] = weakref.WeakKeyDictionary()
+        self.authenticated: MutableMapping[compat.Client, Tuple[str, str]] = weakref.WeakKeyDictionary()
         """Contains all connections that are permanently authenticated after an HTTP CONNECT"""
 
     def load(self, loader):
diff --git a/mitmproxy/tools/console/flowdetailview.py b/mitmproxy/tools/console/flowdetailview.py
index d89078010..b61f2476a 100644
--- a/mitmproxy/tools/console/flowdetailview.py
+++ b/mitmproxy/tools/console/flowdetailview.py
@@ -50,7 +50,7 @@ def flowdetails(state, flow: mitmproxy.flow.Flow):
         if resp:
             parts.append(("HTTP Version", resp.http_version))
         if sc.alpn_proto_negotiated:
-            parts.append(("ALPN", sc.alpn_proto_negotiated))
+            parts.append(("ALPN", strutils.bytes_to_escaped_str(sc.alpn_proto_negotiated)))
 
         text.extend(
             common.format_keyvals(parts, indent=4)
@@ -113,11 +113,12 @@ def flowdetails(state, flow: mitmproxy.flow.Flow):
         if cc.tls_version:
             parts.append(("TLS Version", cc.tls_version))
         if cc.sni:
-            parts.append(("Server Name Indication", cc.sni))
+            parts.append(("Server Name Indication",
+                          strutils.bytes_to_escaped_str(strutils.always_bytes(cc.sni, "idna"))))
         if cc.cipher_name:
             parts.append(("Cipher Name", cc.cipher_name))
         if cc.alpn_proto_negotiated:
-            parts.append(("ALPN", cc.alpn_proto_negotiated))
+            parts.append(("ALPN", strutils.bytes_to_escaped_str(cc.alpn_proto_negotiated)))
 
         text.extend(
             common.format_keyvals(parts, indent=4)
diff --git a/mitmproxy/utils/compat.py b/mitmproxy/utils/compat.py
index 6397dcdea..cce49e435 100644
--- a/mitmproxy/utils/compat.py
+++ b/mitmproxy/utils/compat.py
@@ -4,10 +4,10 @@ new_proxy_core = False
 if new_proxy_core:  # pragma: no cover
     from mitmproxy.proxy2 import context
 
-    Client = context.Client
-    Server = context.Server
+    Client = context.Client  # type: ignore
+    Server = context.Server  # type: ignore
 else:  # pragma: no cover
     from mitmproxy import connections
 
-    Client = connections.ClientConnection
-    Server = connections.ServerConnection
+    Client = connections.ClientConnection  # type: ignore
+    Server = connections.ServerConnection  # type: ignore
diff --git a/tox.ini b/tox.ini
index acae7ce11..2563fbb42 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,7 +17,7 @@ commands =
 [testenv:flake8]
 deps = flake8==3.8.4
 commands =
-  flake8 --jobs 8 mitmproxy pathod examples test release
+  flake8 --jobs 8 mitmproxy pathod examples test release {posargs}
 
 [testenv:filename_matching]
 commands =
@@ -26,18 +26,18 @@ commands =
 [testenv:mypy]
 deps = mypy==0.782
 commands =
-  mypy .
+  mypy . {posargs}
 
 [testenv:rstcheck]
 deps = rstcheck>=2.2,<4.0
 commands =
-  rstcheck README.rst
+  rstcheck README.rst {posargs}
 
 [testenv:individual_coverage]
 deps =
   -rrequirements.txt
 commands =
-  python ./test/individual_coverage.py
+  python ./test/individual_coverage.py {posargs}
 
 [testenv:cibuild]
 passenv = CI_* GITHUB_* AWS_* TWINE_* DOCKER_*