GoogleAppEngine urlfetch timeout exception

Question

Has anyone got any experience with the following exception when using GAE urlfetch?

      DownloadError: ApplicationError: 2 timed out

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Answer 1

The development web server is single-threaded. You can not make a request from your application running inside it to itself. Try running two instances on different ports.

By the way, this should not be a problem once it is deployed, as the actual AppEngine server is of course able to handle multiple simultaneous requests.