SPDY4: SpdySession should send SETTINGS acknowledgements.

net/spdy/spdy_session.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/spdy/spdy_session.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 1965 matching lines @@
 
   if (clear_persisted)
     http_server_properties_->ClearSpdySettings(host_port_pair());
 
   if (net_log_.IsLogging()) {
     net_log_.AddEvent(
         NetLog::TYPE_SPDY_SESSION_RECV_SETTINGS,
         base::Bind(&NetLogSpdySettingsCallback, host_port_pair(),
                    clear_persisted));
   }
+
+  if (GetProtocolVersion() >= SPDY4) {
+    // Send an acknowledgment of the setting.
+    SpdySettingsIR settings_ir;
+    settings_ir.set_is_ack(true);
+    EnqueueSessionWrite(
+        HIGHEST,
+        SETTINGS,
+        scoped_ptr<SpdyFrame>(
+            buffered_spdy_framer_->SerializeFrame(settings_ir)));
+  }
 }
 
 void SpdySession::OnSetting(SpdySettingsIds id,
                             uint8 flags,
                             uint32 value) {
   CHECK(in_io_loop_);
 
   if (availability_state_ == STATE_CLOSED)
     return;
 
@@ skipping 1054 matching lines @@
     if (!queue->empty()) {
       SpdyStreamId stream_id = queue->front();
       queue->pop_front();
       return stream_id;
     }
   }
   return 0;
 }
 
 }  // namespace net