From 13f030ccb5f513746fd2bb24c0a3921c5f91f121 Mon Sep 17 00:00:00 2001
From: Maximilian Hils <git@maximilianhils.com>
Date: Sun, 3 Aug 2014 16:25:38 +0200
Subject: [PATCH] suppress SPDY/HTTP2 announcement headers, fix #277

---
 libmproxy/protocol/http.py | 23 ++++++++++++-----------
 libmproxy/utils.py         |  6 ------
 test/test_utils.py         |  6 ------
 3 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/libmproxy/protocol/http.py b/libmproxy/protocol/http.py
index aed538ef9..8e470b018 100644
--- a/libmproxy/protocol/http.py
+++ b/libmproxy/protocol/http.py
@@ -320,15 +320,13 @@ class HTTPRequest(HTTPMessage):
 
     def _assemble_headers(self):
         headers = self.headers.copy()
-        utils.del_all(
-            headers,
-            [
-                'Proxy-Connection',
-                'Keep-Alive',
-                'Connection',
-                'Transfer-Encoding'
-            ]
-        )
+        for k in ['Proxy-Connection',
+                  'Keep-Alive',
+                  'Connection',
+                  'Transfer-Encoding']:
+            del headers[k]
+        if headers["Upgrade"] == ["h2c"]:  # Suppress HTTP2 https://http2.github.io/http2-spec/index.html#discover-http
+            del headers["Upgrade"]
         if not 'host' in headers:
             headers["Host"] = [utils.hostport(self.scheme,
                                               self.host or self.flow.server_conn.address.host,
@@ -636,9 +634,12 @@ class HTTPResponse(HTTPMessage):
 
     def _assemble_headers(self, preserve_transfer_encoding=False):
         headers = self.headers.copy()
-        utils.del_all(headers, ['Proxy-Connection'])
+        for k in ['Proxy-Connection',
+                  'Alternate-Protocol',
+                  'Alt-Svc']:
+            del headers[k]
         if not preserve_transfer_encoding:
-            utils.del_all(headers, ['Transfer-Encoding'])
+            del headers['Transfer-Encoding']
 
         if self.content:
             headers["Content-Length"] = [str(len(self.content))]
diff --git a/libmproxy/utils.py b/libmproxy/utils.py
index ca48bdf21..33af035f1 100644
--- a/libmproxy/utils.py
+++ b/libmproxy/utils.py
@@ -64,12 +64,6 @@ def urlencode(s):
     return urllib.urlencode(s, False)
 
 
-def del_all(dict, keys):
-    for key in keys:
-        if key in dict:
-            del dict[key]
-
-
 def pretty_size(size):
     suffixes = [
         ("B",   2**10),
diff --git a/test/test_utils.py b/test/test_utils.py
index 11c26dba8..d99a146df 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -22,12 +22,6 @@ def test_isXml():
     assert utils.isXML("  \n<foo")
 
 
-def test_del_all():
-    d = dict(a=1, b=2, c=3)
-    utils.del_all(d, ["a", "x", "b"])
-    assert d.keys() == ["c"]
-
-
 def test_clean_hanging_newline():
     s = "foo\n"
     assert utils.clean_hanging_newline(s) == "foo"