Request Throttler : Exponential back-off

net/base/net_error_list.h

 // Copyright (c) 2010 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 154 matching lines @@
 NET_ERROR(PROXY_AUTH_REQUESTED, -127)
 
 // A known TLS strict server didn't offer the renegotiation extension.
 NET_ERROR(SSL_UNSAFE_NEGOTIATION, -128)
 
 // The socket is reporting that we tried to provide new credentials after a
 // a failed attempt on a connection without keep alive.  We need to
 // reestablish the transport socket in order to retry the authentication.
 NET_ERROR(RETRY_CONNECTION, -129)
 
+// The request throttler module cancelled this request because the are too many
+// requests to a server that is failing requests.
+NET_ERROR(TEMPORARILY_THROTTLED_BY_DDOS, -130)
+
 // Certificate error codes
 //
 // The values of certificate error codes must be consecutive.
 
 // The server responded with a certificate whose common name did not match
 // the host name.  This could mean:
 //
 // 1. An attacker has redirected our traffic to his server and is
 //    presenting a certificate for which he knows the private key.
 //
@@ skipping 233 matching lines @@
 NET_ERROR(FTP_SYNTAX_ERROR, -605)
 
 // Server does not support the command we issued.
 // FTP response codes 502, 504.
 NET_ERROR(FTP_COMMAND_NOT_SUPPORTED, -606)
 
 // Server rejected our command because we didn't issue the commands in right
 // order.
 // FTP response code 503.
 NET_ERROR(FTP_BAD_COMMAND_SEQUENCE, -607)