Send PING to check the status of the SPDY connection.

net/spdy/spdy_framer.h

 // 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.
 
 #ifndef NET_SPDY_SPDY_FRAMER_H_
 #define NET_SPDY_SPDY_FRAMER_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 268 matching lines @@
   // On failure, returns NULL.
   SpdyFrame* DecompressFrame(const SpdyFrame& frame);
 
   // Create a copy of a frame.
   // Returned frame must be freed with "delete".
   SpdyFrame* DuplicateFrame(const SpdyFrame& frame);
 
   // Returns true if a frame could be compressed.
   bool IsCompressible(const SpdyFrame& frame) const;
 
+  // Returns true if the frame is a PING frame.
+  bool IsPingFrame(const SpdyFrame& frame) const;
+
   // Get the minimum size of the control frame for the given control frame
   // type. This is useful for validating frame blocks.
   static size_t GetMinimumControlFrameSize(SpdyControlType type);
 
   // Get the stream ID for the given control frame (SYN_STREAM, SYN_REPLY, and
   // HEADERS). If the control frame is NULL or of another type, this
   // function returns kInvalidStream.
   static SpdyStreamId GetControlFrameStreamId(
       const SpdyControlFrame* control_frame);
 
@@ skipping 173 matching lines @@
 
   SpdyFramerVisitorInterface* visitor_;
 
   static bool compression_default_;
   static int spdy_version_;
 };
 
 }  // namespace spdy
 
 #endif  // NET_SPDY_SPDY_FRAMER_H_