Log an INFO message whenever we receive an auth challenge....

net/http/http_network_transaction.h

 // Copyright (c) 2006-2008 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_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <string>
 
 #include "base/ref_counted.h"
@@ skipping 144 matching lines @@
   // Resets the members of the transaction so it can be restarted.
   void ResetStateForRestart();
 
   // Attach any credentials needed for the proxy server or origin server.
   void ApplyAuth();
 
   // Helper used by ApplyAuth(). Adds either the proxy auth header, or the
   // origin server auth header, as specified by |target|
   void AddAuthorizationHeader(HttpAuth::Target target);
 
+  // Returns a log message for all the response headers related to the auth
+  // challenge.
+  std::string AuthChallengeLogMessage() const;
+
   // Handles HTTP status code 401 or 407.
   // HandleAuthChallenge() returns a network error code, or OK on success.
   // May update |pending_auth_target_| or |response_.auth_challenge|.
   int HandleAuthChallenge();
 
   // Populates response_.auth_challenge with the challenge information, so that
   // URLRequestHttpJob can prompt for a username/password.
   void PopulateAuthChallenge(HttpAuth::Target target);
 
   // Invalidates any auth cache entries after authentication has failed.
@@ skipping 15 matching lines @@
     return auth_handler_[target].get() && !auth_identity_[target].invalid;
   }
 
   // Get the {scheme, host, port} for the authentication target
   GURL AuthOrigin(HttpAuth::Target target) const;
 
   // Get the absolute path of the resource needing authentication.
   // For proxy authentication the path is always empty string.
   std::string AuthPath(HttpAuth::Target target) const;
 
+  // Returns a string representation of a HttpAuth::Target value that can be
+  // used in log messages.
+  static std::string AuthTargetString(HttpAuth::Target target);
+
   // The following three auth members are arrays of size two -- index 0 is
   // for the proxy server, and index 1 is for the origin server.
   // Use the enum HttpAuth::Target to index into them.
 
   // auth_handler encapsulates the logic for the particular auth-scheme.
   // This includes the challenge's parameters. If NULL, then there is no
   // associated auth handler.
   scoped_refptr<HttpAuthHandler> auth_handler_[2];
 
   // auth_identity_ holds the (username/password) that should be used by
@@ skipping 127 matching lines @@
     STATE_DRAIN_BODY_FOR_AUTH_RESTART,
     STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE,
     STATE_NONE
   };
   State next_state_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_