Anti-DDoS enhancements: Log to net log, UMA stats, improved policy.

chrome/common/net/gaia/gaia_oauth_client.cc

 // 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.
 
 #include "chrome/common/net/gaia/gaia_oauth_client.h"
 
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/common/net/http_return.h"
@@ skipping 105 matching lines @@
 void GaiaOAuthClient::Core::OnURLFetchComplete(
     const URLFetcher* source,
     const GURL& url,
     const net::URLRequestStatus& status,
     int response_code,
     const net::ResponseCookies& cookies,
     const std::string& data) {
   bool should_retry = false;
   HandleResponse(source, url, status, response_code, data, &should_retry);
   if (should_retry) {
-    // If the response code is greater than or equal to 500, then the back-off
-    // period has been increased at the network level; otherwise, explicitly
-    // call ReceivedContentWasMalformed() to count the current request as a
-    // failure and increase the back-off period.
-    if (response_code < 500)
-      request_->ReceivedContentWasMalformed();
+    // Explicitly call ReceivedContentWasMalformed() to ensure the current
+    // request gets counted as a failure for calculation of the back-off
+    // period.  If it was already a failure by status code, this call will
+    // be ignored.
+    request_->ReceivedContentWasMalformed();
     num_retries_++;
     request_->Start();
   } else {
     request_.reset();
   }
 }
 
 void GaiaOAuthClient::Core::HandleResponse(
     const URLFetcher* source,
     const GURL& url,
@@ skipping 67 matching lines @@
                                    const std::string& refresh_token,
                                    int max_retries,
                                    Delegate* delegate) {
   return core_->RefreshToken(oauth_client_info,
                              refresh_token,
                              max_retries,
                              delegate);
 }
 
 }  // namespace gaia