Respect cookies set in a 401 responses when restarting the http transaction....

net/http/http_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_TRANSACTION_H_
 #define NET_HTTP_HTTP_TRANSACTION_H_
 
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 
@@ skipping 37 matching lines @@
   //
   // NOTE: The transaction is not responsible for deleting the callback object.
   //
   virtual int RestartIgnoringLastError(CompletionCallback* callback) = 0;
 
   // Restarts the HTTP transaction with authentication credentials.
   virtual int RestartWithAuth(const std::wstring& username,
                               const std::wstring& password,
                               CompletionCallback* callback) = 0;
 
+  // Returns true if auth is ready to be continued. Callers should check
+  // this value anytime Start() completes: if it is true, the transaction
+  // can be resumed with RestartWithAuth(L"", L"", callback) to resume
+  // the automatic auth exchange. This notification gives the caller a
+  // chance to process the response headers from all of the intermediate
+  // restarts needed for authentication.
+  virtual bool IsReadyToRestartForAuth() = 0;
+
   // Once response info is available for the transaction, response data may be
   // read by calling this method.
   //
   // Response data is copied into the given buffer and the number of bytes
   // copied is returned.  ERR_IO_PENDING is returned if response data is not
   // yet available.  The CompletionCallback is notified when the data copy
   // completes, and it is passed the number of bytes that were successfully
   // copied.  Or, if a read error occurs, the CompletionCallback is notified of
   // the error.  Any other negative return value indicates that the transaction
   // could not be read.
@@ skipping 13 matching lines @@
   virtual LoadState GetLoadState() const = 0;
 
   // Returns the upload progress in bytes.  If there is no upload data,
   // zero will be returned.  This does not include the request headers.
   virtual uint64 GetUploadProgress() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_H_