Clear alternate protocols on empty or invalid header

net/http/http_network_transaction.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_network_transaction.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 61 matching lines @@
     const HttpResponseHeaders& headers,
     const HostPortPair& http_host_port_pair) {
   if (!headers.HasHeader(kAlternateProtocolHeader))
     return;
 
   std::vector<std::string> alternate_protocol_values;
   void* iter = NULL;
   std::string alternate_protocol_str;
   while (headers.EnumerateHeader(&iter, kAlternateProtocolHeader,
                                  &alternate_protocol_str)) {
-    alternate_protocol_values.push_back(alternate_protocol_str);
+    base::TrimWhitespaceASCII(alternate_protocol_str, base::TRIM_ALL,
+                              &alternate_protocol_str);
+    if (!alternate_protocol_str.empty()) {
+      alternate_protocol_values.push_back(alternate_protocol_str);
+    }
   }
 
   session->http_stream_factory()->ProcessAlternateProtocol(
       session->http_server_properties(),
       alternate_protocol_values,
       http_host_port_pair,
       *session);
 }
 
 base::Value* NetLogSSLVersionFallbackCallback(
@@ skipping 1441 matching lines @@
       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
                                        state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net