Bypass the DataReductionProxy for all POST requests

net/base/proxy_delegate.h

 // 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.
 
 #ifndef NET_BASE_PROXY_DELEGATE_H_
 #define NET_BASE_PROXY_DELEGATE_H_
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 
@@ skipping 11 matching lines @@
 
 // Delegate for setting up a connection.
 class NET_EXPORT ProxyDelegate {
  public:
   ProxyDelegate() {
   }
 
   virtual ~ProxyDelegate() {
   }
 
-  // Called as the proxy is being resolved for |url|. Allows the delegate to
-  // override the proxy resolution decision made by ProxyService. The delegate
-  // may override the decision by modifying the ProxyInfo |result|.
+  // Called as the proxy is being resolved for |url| for a |method| request.

[bengr, 2016/02/26 23:43:33]

You need to say somewhere (here, but maybe also other places) that the caller
may pass in an empty string for the method to request method-agnostic
resolution.

+  // Allows the delegate to override the proxy resolution decision made by
+  // ProxyService. The delegate may override the decision by modifying the
+  // ProxyInfo |result|.
   virtual void OnResolveProxy(const GURL& url,
+                              const std::string& method,

[bengr, 2016/02/26 23:43:33]

#include <string>

                               int load_flags,
                               const ProxyService& proxy_service,
                               ProxyInfo* result) = 0;
 
   // Called when use of |bad_proxy| fails due to |net_error|. |net_error| is
   // the network error encountered, if any, and OK if the fallback was
   // for a reason other than a network error (e.g. the proxy service was
   // explicitly directed to skip a proxy).
   virtual void OnFallback(const ProxyServer& bad_proxy,
                           int net_error) = 0;
@@ skipping 25 matching lines @@
   // allowed to push cross-origin resources.
   virtual bool IsTrustedSpdyProxy(const net::ProxyServer& proxy_server) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyDelegate);
 };
 
 }
 
 #endif  // NET_BASE_PROXY_DELEGATE_H_