Race preconnects to HTTP2 proxies that support alternate proxies

net/http/http_network_session.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 189 matching lines @@
     // Enable support for Token Binding.
     bool enable_token_binding;
 
     // Enable HTTP/0.9 for HTTP/HTTPS on ports other than the default one for
     // each protocol.
     bool http_09_on_non_default_ports_enabled;
 
     // If true, only one pending preconnect is allowed to proxies that support
     // request priorities.
     bool restrict_to_one_preconnect_for_proxies;
+    // If true, preconnect jobs to HTTP2 proxies are raced with an alternative
+    // job if the proxy supports an alternative proxy.
+    bool race_preconnects_to_proxies;

[Ryan Hamilton, 2017/01/23 18:05:53]

The comment says this is only for HTTP2 proxies, but the member name does not
mention http2. I suspect (and hope) that this also applies to QUIC proxies...

[tbansal1, 2017/01/23 21:48:22]

Done.
Did you mean a QUIC proxy explicitly specified as quic://myproxy...
Then, answer is no.

[Ryan Hamilton, 2017/01/24 19:36:59]

Hm. Seems like it should work for QUIC proxies too, shouldn't it?

   };
 
   enum SocketPoolType {
     NORMAL_SOCKET_POOL,
     WEBSOCKET_SOCKET_POOL,
     NUM_SOCKET_POOL_TYPES
   };
 
   explicit HttpNetworkSession(const Params& params);
   ~HttpNetworkSession() override;
@@ skipping 115 matching lines @@
   NextProtoVector next_protos_;
 
   Params params_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_