Docserver: Fix broken redirect on code.google.com/chrome/

chrome/common/extensions/docs/server2/render_servlet.py

 # Copyright 2013 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.
 
 import hashlib
 import logging
 import posixpath
 import traceback
 
 from branch_utility import BranchUtility
@@ skipping 73 matching lines @@
     content_provider, serve_from, path = (
         server_instance.content_providers.GetByServeFrom(request_path))
     assert content_provider, 'No ContentProvider found for %s' % path
 
     redirect = Redirector(
         server_instance.compiled_fs_factory,
         content_provider.file_system).Redirect(self._request.host, path)
     if redirect is not None:
       # Absolute redirects stay absolute, relative redirects are relative to
       # |serve_from|; all redirects eventually need to be *served* as absolute.
-      if not redirect.startswith('/'):
+      if not redirect.startswith(('/', 'http://', 'https://')):
         redirect = '/' + posixpath.join(serve_from, redirect)
       return Response.Redirect(redirect, permanent=False)
 
     canonical_path = content_provider.GetCanonicalPath(path)
     if canonical_path != path:
       redirect_path = posixpath.join(serve_from, canonical_path)
       return Response.Redirect('/' + redirect_path, permanent=False)
 
     if request_path.endswith('/'):
       # Directory request hasn't been redirected by now. Default behaviour is
@@ skipping 37 matching lines @@
     if etag is None:
       # Note: we're using md5 as a convenient and fast-enough way to identify
       # content. It's not intended to be cryptographic in any way, and this
       # is *not* what etags is for. That's what SSL is for, this is unrelated.
       etag = '"%s"' % hashlib.md5(content).hexdigest()
 
     headers = _MakeHeaders(content_type, etag=etag)
     if etag == self._request.headers.get('If-None-Match'):
       return Response.NotModified('Not Modified', headers=headers)
     return Response.Ok(content, headers=headers)