Re-set referrer on issuing a validation request for a cached resource.

Source/core/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 762 matching lines @@
 
 ResourcePtr<Resource> ResourceFetcher::revalidateResource(const FetchRequest& request, Resource* resource)
 {
     ASSERT(resource);
     ASSERT(resource->inCache());
     ASSERT(resource->isLoaded());
     ASSERT(resource->canUseCacheValidator());
     ASSERT(!resource->resourceToRevalidate());
 
     ResourceRequest revalidatingRequest(resource->resourceRequest());
+    revalidatingRequest.clearHTTPReferrer();

[Nate Chapin, 2014/03/17 16:22:26]

This works, though I wonder...is there anything other than the url that we need
from the old ResourceRequest?

[sof, 2014/03/17 17:04:39]

If the resource is eligible for reuse, then presumably there will be headers you
do want to propagate along?

     addAdditionalRequestHeaders(revalidatingRequest, resource->type());
 
     const AtomicString& lastModified = resource->response().httpHeaderField("Last-Modified");
     const AtomicString& eTag = resource->response().httpHeaderField("ETag");
     if (!lastModified.isEmpty() || !eTag.isEmpty()) {
         ASSERT(context().cachePolicy(document()) != CachePolicyReload);
         if (context().cachePolicy(document()) == CachePolicyRevalidate)
             revalidatingRequest.setHTTPHeaderField("Cache-Control", "max-age=0");
         if (!lastModified.isEmpty())
             revalidatingRequest.setHTTPHeaderField("If-Modified-Since", lastModified);
@@ skipping 606 matching lines @@
     case Revalidate:
         ++m_revalidateCount;
         return;
     case Use:
         ++m_useCount;
         return;
     }
 }
 
 }