Send PING to check the status of the SPDY connection.

net/http/http_network_layer.cc

 // Copyright (c) 2011 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_layer.h"
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
@@ skipping 24 matching lines @@
   DCHECK(session);
 
   return new HttpNetworkLayer(session);
 }
 
 // static
 void HttpNetworkLayer::EnableSpdy(const std::string& mode) {
   static const char kOff[] = "off";
   static const char kSSL[] = "ssl";
   static const char kDisableSSL[] = "no-ssl";
+  static const char kDisablePing[] = "no-ping";
   static const char kExclude[] = "exclude";  // Hosts to exclude
   static const char kDisableCompression[] = "no-compress";
   static const char kDisableAltProtocols[] = "no-alt-protocols";
   static const char kEnableVersionOne[] = "v1";
   static const char kForceAltProtocols[] = "force-alt-protocols";
   static const char kSingleDomain[] = "single-domain";
 
   // If flow-control is enabled, received WINDOW_UPDATE and SETTINGS
   // messages are processed and outstanding window size is actually obeyed
   // when sending data frames, and WINDOW_UPDATE messages are generated
@@ skipping 39 matching lines @@
 
     if (option == kOff) {
       HttpStreamFactory::set_spdy_enabled(false);
     } else if (option == kDisableSSL) {
       SpdySession::SetSSLMode(false);  // Disable SSL
       HttpStreamFactory::set_force_spdy_over_ssl(false);
       HttpStreamFactory::set_force_spdy_always(true);
     } else if (option == kSSL) {
       HttpStreamFactory::set_force_spdy_over_ssl(true);
       HttpStreamFactory::set_force_spdy_always(true);
+    } else if (option == kDisablePing) {
+      SpdySession::set_enable_ping_based_connection_checking(false);
     } else if (option == kExclude) {
       HttpStreamFactory::add_forced_spdy_exclusion(value);
     } else if (option == kDisableCompression) {
       spdy::SpdyFramer::set_enable_compression_default(false);
     } else if (option == kEnableNPN) {
       HttpStreamFactory::set_use_alternate_protocols(use_alt_protocols);
       HttpStreamFactory::set_next_protos(kNpnProtosFull);
     } else if (option == kEnableNpnHttpOnly) {
       // Avoid alternate protocol in this case. Otherwise, browser will try SSL
       // and then fallback to http. This introduces extra load.
@@ skipping 50 matching lines @@
 
   if (session_)
     session_->CloseIdleConnections();
 }
 
 void HttpNetworkLayer::OnResume() {
   suspended_ = false;
 }
 
 }  // namespace net