Second attempt to work around App Engine flakiness by retrying upon URLError...

third_party/upload.py

 #!/usr/bin/env python
 #
 # Copyright 2007 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
@@ skipping 398 matching lines @@
             url_loc = urlparse.urlparse(url)
             self._Authenticate('%s://%s' % (url_loc[0], url_loc[1]))
 ##           elif e.code >= 500 and e.code < 600:
 ##             # Server Error - try again.
 ##             continue
           elif e.code == 301:
             # Handle permanent redirect manually.
             url = e.info()["location"]
           else:
             raise
+        except urllib2.URLError, e:
+          if hasattr(e, 'reason'):

[M-A Ruel, 2011/01/17 18:17:17]

you could rewrite as
reason = getattr(e, 'reason', None)
and continue with line 422.

[Ken Russell (switch to Gerrit), 2011/01/18 21:24:10]

Done.

+            reason = e.reason
+            if isinstance(reason, str) and reason.find("110") != -1:
+              # Connection timeout error.
+              if tries <= 3:
+                # Try again.
+                continue
+          raise
     finally:
       socket.setdefaulttimeout(old_timeout)
 
 
 class HttpRpcServer(AbstractRpcServer):
   """Provides a simplified RPC-style interface for HTTP requests."""
 
   def _Authenticate(self, *args):
     """Save the cookie jar after authentication."""
     super(HttpRpcServer, self)._Authenticate(*args)
@@ skipping 1348 matching lines @@
   try:
     RealMain(sys.argv)
   except KeyboardInterrupt:
     print
     StatusUpdate("Interrupted.")
     sys.exit(1)
 
 
 if __name__ == "__main__":
   main()