Support for new data reduction proxy via header

net/http/http_network_transaction.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/http/http_network_transaction.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 108 matching lines @@
   return dict;
 }
 
 #if defined(SPDY_PROXY_AUTH_ORIGIN)
 // Returns true if |response_headers| contains the data reduction proxy Via
 // header value.
 bool IsChromeProxyResponse(const net::HttpResponseHeaders* response_headers) {
   if (!response_headers) {
     return false;
   }
-  const char kDataReductionProxyViaValue[] = "1.1 Chrome Compression Proxy";
+
+  const size_t kVersionSize = 4;
+  const char kDataReductionProxyViaValue[] = "Chrome-Compression-Proxy";
   size_t value_len = strlen(kDataReductionProxyViaValue);
   void* iter = NULL;
-  std::string temp;
-  while (response_headers->EnumerateHeader(&iter, "Via", &temp)) {
-    std::string::const_iterator it =
-        std::search(temp.begin(), temp.end(),
-                    kDataReductionProxyViaValue,
-                    kDataReductionProxyViaValue + value_len,
-                    base::CaseInsensitiveCompareASCII<char>());
-    if (it != temp.end())
+  std::string value;
+
+  // Case-sensitive comparison. Assumes the received protocol and the space
+  // following it are always |kVersionSize| characters. E.g.,
+  // 'Via: 1.1 Chrome-Compression-Proxy'
+  while (response_headers->EnumerateHeader(&iter, "via", &value)) {
+    if (!value.compare(kVersionSize, value_len, kDataReductionProxyViaValue))
       return true;
   }
+
+  // TODO(bengr): Remove deprecated header value.
+  const char kDeprecatedDataReductionProxyViaValue[] =
+      "1.1 Chrome Compression Proxy";
+  iter = NULL;
+  while (response_headers->EnumerateHeader(&iter, "via", &value))
+    if (value == kDeprecatedDataReductionProxyViaValue) return true;
+
   return false;
 }
 #endif
 
 }  // namespace
 
 //-----------------------------------------------------------------------------
 
 HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
                                                HttpNetworkSession* session)
@@ skipping 1495 matching lines @@
       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
                                        state);
       break;
   }
   return description;
 }
 
 #undef STATE_CASE
 
 }  // namespace net