Bypass DRP if a redirect cycle is detected

components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.cc

 // Copyright 2014 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 "components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h"
 
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
@@ skipping 18 matching lines @@
     return UNKNOWN_TYPE;
   }
 
   // Check if the request came through the Data Reduction Proxy before checking
   // if proxies are bypassed, to avoid misreporting cases where the Data
   // Reduction Proxy was bypassed between the request being sent out and the
   // response coming in. For 304 responses, check if the request was sent to the
   // Data Reduction Proxy, since 304s aren't required to have a Via header even
   // if they came through the Data Reduction Proxy.
   if (request.response_headers() &&
-      (HasDataReductionProxyViaHeader(request.response_headers(), nullptr) ||
+      (HasDataReductionProxyViaHeader(*request.response_headers(), nullptr) ||
        (request.response_headers()->response_code() == net::HTTP_NOT_MODIFIED &&
         config.WasDataReductionProxyUsed(&request, nullptr)))) {
     return VIA_DATA_REDUCTION_PROXY;
   }
 
   base::TimeDelta bypass_delay;
   if (config.AreDataReductionProxiesBypassed(
       request, data_reduction_proxy_config, &bypass_delay)) {
     if (bypass_delay > base::TimeDelta::FromSeconds(kLongBypassDelayInSeconds))
       return LONG_BYPASS;
@@ skipping 10 matching lines @@
        !config.IsDataReductionProxy(request.proxy_server(), NULL)) ||
       config.IsBypassedByDataReductionProxyLocalRules(
           request, data_reduction_proxy_config)) {
     return SHORT_BYPASS;
   }
 
   return UNKNOWN_TYPE;
 }
 
 }  // namespace data_reduction_proxy