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Editorial Team
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Asked: 2026-06-15T08:57:26+00:00

I have seen many questions about using cookies with url fetch on App Engine,

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I have seen many questions about using cookies with url fetch on App Engine, but many people doing it incorrectly, and no confirmed-as-working solutions on Java App Engine.

All I want to do is:

  1. Make one request
  2. Get the cookies from that request.
  3. Make a second request, with those cookies.

How hard can it be??

This is easy to do on the dev server, because the dev server copies cookies across requests automatically – and indeed it’s impossible to stop it doing this. But the real App Engine urlfetch service does not do this.

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1 Answer

  1. Editorial Team

    Use

    new HTTPRequest(url, HTTPMethod.GET, fetchOptions.doNotFollowRedirects())

    to create the request object.

    The doNotFollowRedirects() is essential for some reason. I don’t understand why.

    Then get the set-cookie headers from the response (ones whose names equalsIgnoreCase("Set-Cookie")) and create a corresponding Cookie header – trimming off everything after the semicolon in each Set-Cookie header, if there is one, and then concatenating all the cookies together with ; as a separator.

    This doesn’t correctly deal with expiration etc., but this should be enough for most purposes.

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