HTTP2 draft 13: support unknown frame types and settings types as extensions.

net/spdy/spdy_protocol.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_protocol.h"
 
 namespace net {
 
 SpdyFrameWithNameValueBlockIR::SpdyFrameWithNameValueBlockIR(
     SpdyStreamId stream_id) : SpdyFrameWithFinIR(stream_id) {}
@@ skipping 25 matching lines @@
       }
 
       // WINDOW_UPDATE is the last valid frame.
       if (frame_type_field > SerializeFrameType(version, WINDOW_UPDATE)) {
         return false;
       }
 
       return true;
     case SPDY4:
     case SPDY5:
+      // Check for recognized extensions.
+      if (frame_type_field == SerializeFrameType(version, ALTSVC) ||
+          frame_type_field == SerializeFrameType(version, BLOCKED)) {
+        return true;
+      }
+
       // DATA is the first valid frame.
       if (frame_type_field < SerializeFrameType(version, DATA)) {
         return false;
       }
 
-      // BLOCKED is the last valid frame.
-      if (frame_type_field > SerializeFrameType(version, BLOCKED)) {
+      // CONTINUATION is the last valid frame.
+      if (frame_type_field > SerializeFrameType(version, CONTINUATION)) {
         return false;
       }
 
       return true;
   }
 
   LOG(DFATAL) << "Unhandled SPDY version " << version;
   return false;
 }
 
@@ skipping 98 matching lines @@
         case PUSH_PROMISE:
           return 5;
         case PING:
           return 6;
         case GOAWAY:
           return 7;
         case WINDOW_UPDATE:
           return 8;
         case CONTINUATION:
           return 9;
+        // ALTSVC and BLOCKED are extensions.
         case ALTSVC:
           return 10;
         case BLOCKED:
           return 11;
         default:
           LOG(DFATAL) << "Serializing unhandled frame type " << frame_type;
           return -1;
       }
   }
 
@@ skipping 655 matching lines @@
       parent_stream_id_(parent_stream_id),
       weight_(weight),
       exclusive_(exclusive) {
 }
 
 void SpdyPriorityIR::Visit(SpdyFrameVisitor* visitor) const {
   return visitor->VisitPriority(*this);
 }
 
 }  // namespace net