Support for new data reduction proxy via header

net/http/http_response_headers.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.
 
 // The rules for header parsing were borrowed from Firefox:
 // http://lxr.mozilla.org/seamonkey/source/netwerk/protocol/http/src/nsHttpResponseHead.cpp
 // The rules for parsing content-types were also borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_response_headers.h"
@@ skipping 1401 matching lines @@
     proxy_info->bypass_all = true;
     return true;
   }
 
   // Next, look for 'bypass'.
   if (GetChromeProxyBypassDuration("bypass=", &proxy_info->bypass_duration))
     return true;
 
   return false;
 }
+
+bool HttpResponseHeaders::IsChromeProxyResponse() const {
+  const size_t kVersionSize = 4;
+  const char kChromeProxyViaValue[] = "Chrome-Compression-Proxy";
+  size_t value_len = strlen(kChromeProxyViaValue);
+  void* iter = NULL;
+  std::string value;
+
+  // Case-sensitive comparison of |value|. Assumes the received protocol and the
+  // space following it are always |kVersionSize| characters. E.g.,
+  // 'Via: 1.1 Chrome-Compression-Proxy'
+  while (EnumerateHeader(&iter, "via", &value)) {
+    if (!value.compare(kVersionSize, value_len, kChromeProxyViaValue))
+      return true;
+  }
+
+  // TODO(bengr): Remove deprecated header value.
+  const char kDeprecatedChromeProxyViaValue[] = "1.1 Chrome Compression Proxy";
+  iter = NULL;
+  while (EnumerateHeader(&iter, "via", &value))
+    if (value == kDeprecatedChromeProxyViaValue)
+      return true;
+
+  return false;
+}
 #endif  // defined(SPDY_PROXY_AUTH_ORIGIN)
 
 }  // namespace net