To mitigate the effects of hanging 0-RTT QUIC connections,

net/quic/quic_network_transaction_unittest.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 <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
@@ skipping 842 matching lines @@
   AddQuicAlternateProtocolMapping(MockCryptoClientStream::ZERO_RTT);
 
   SendRequestAndExpectHttpResponse("hello from http");
 
   ExpectBrokenAlternateProtocolMapping();
 
   EXPECT_TRUE(quic_data.at_read_eof());
   EXPECT_TRUE(quic_data.at_write_eof());
 }
 
+TEST_P(QuicNetworkTransactionTest, HangingZeroRttFallback) {
+  // Alternate-protocol job
+  MockRead quic_reads[] = {
+    MockRead(ASYNC, ERR_IO_PENDING),
+  };
+  StaticSocketDataProvider quic_data(quic_reads, arraysize(quic_reads),
+                                     NULL, 0);
+  socket_factory_.AddSocketDataProvider(&quic_data);
+
+  // Main job that will proceed when the QUIC job fails.
+  MockRead http_reads[] = {
+    MockRead("HTTP/1.1 200 OK\r\n\r\n"),
+    MockRead("hello from http"),
+    MockRead(SYNCHRONOUS, ERR_TEST_PEER_CLOSE_AFTER_NEXT_MOCK_READ),
+    MockRead(ASYNC, OK)
+  };
+
+  StaticSocketDataProvider http_data(http_reads, arraysize(http_reads),
+                                     NULL, 0);
+  socket_factory_.AddSocketDataProvider(&http_data);
+
+  CreateSessionWithNextProtos();
+
+  AddQuicAlternateProtocolMapping(MockCryptoClientStream::ZERO_RTT);
+
+  SendRequestAndExpectHttpResponse("hello from http");
+}
+
 TEST_P(QuicNetworkTransactionTest, BrokenAlternateProtocolOnConnectFailure) {
   // Alternate-protocol job will fail before creating a QUIC session.
   StaticSocketDataProvider quic_data(NULL, 0, NULL, 0);
   quic_data.set_connect_data(MockConnect(SYNCHRONOUS,
                                          ERR_INTERNET_DISCONNECTED));
   socket_factory_.AddSocketDataProvider(&quic_data);
 
   // Main job which will succeed even though the alternate job fails.
   MockRead http_reads[] = {
     MockRead("HTTP/1.1 200 OK\r\n\r\n"),
@@ skipping 49 matching lines @@
                          NULL,
                          net_log_.bound());
 
   CreateSessionWithNextProtos();
   AddQuicAlternateProtocolMapping(MockCryptoClientStream::ZERO_RTT);
   SendRequestAndExpectHttpResponse("hello world");
 }
 
 }  // namespace test
 }  // namespace net