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When using Tomcats parallell deployment, Tomcat redirects users to different version according to this scheme:

  • If no session information is present in the request, use the latest version.
  • If session information is present in the request, check the session manager of each version for a matching session and if one is found, use that version.
  • If session information is present in the request but no matching session can be found, use the latest version.

However, I would like to control myself which visitor gets to which version, so I can A/B test deployments.

Ideally, I should be able to control this through a valve, a cookie, header or similar. I've checked the code and documentation, but cannot find a way to externally control this.

Is it possible?

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As of now (Oct/2015) it is not possible.

There is a thread in Tomcat Users mailinglist where it is discussed:

Parallel Deployment: Can I request a specific webapp version?

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