Apache Traffic Serverâ„¢ software is a fast, scalable and extensible HTTP/1.1 and HTTP/2 compliant caching proxy server. Formerly a commercial product, Yahoo! donated it to the Apache Foundation, and currently used by several major CDNs and content owners.

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  • Caching

    Improve your response time, while reducing server load and bandwidth needs by caching and reusing frequently-requested web pages, images, and web service calls.

  • Proxying

    Easily add keep-alive, filter or anonymize content requests, or add load balancing by adding a proxy layer.

  • Fast

    Scales well on modern SMP hardware, handling 10s of thousands of requests per second.

  • Extensible

    APIs to write your own plug-ins to do anything from modifying HTTP headers to handling ESI requests to writing your own cache algorithm.

  • Proven

    Handling over 400TB a day at Yahoo! both as forward and reverse proxies, Apache Traffic Server is battle hardened. Also visit our Customers page for some of our corporate users and supporters.

  • Having trouble with builds, configurations or are you getting errors you don't understand? Subscribe to our Users Mailing List or join our #traffic-server channel on The ASF Slack workspace to get help! Use your @apache.org email address to automatically join. If you need a workspace invitation, contact us on our devevelop mailing list, or ask any ASF committer.

  • Can't get your plugin to work? Have questions about the ATS code? Or maybe you have suggestions for improvements or new features? Get help from developers or start a discussion on our dev discussion list.

  • Report or confirm bugs or try out the latest patches from our Bug Tracker

  • Learn how to ask good questions, create useful bug reports and how to apply patches.

  • Subscribe and help out on the users Mailing List or simply share your usecase or experience. For sometimes speedier responses check out our Slack channel #traffic-server on The ASF Slack workspace.

  • Impress developers or help others by participating on our dev discussion list or follow the latest development on our commits list.

  • Report issues or bring patches to our Bug Tracker

  • Visit our wiki to see a list of Projects we are currently working on.

  • Learn how to create patches to the code or the documentation and how to debug Apache Traffic Server.

  • We've tagged github issues that have a low entrance barrier.

  • October 9, 2023:We are releasing both v9.2.3 and v8.1.9. We recommend everyone to upgrade to one of these versions of ATS.
  • August 3, 2023: We are releasing both v9.2.2 and v8.1.8 which include security fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • June 12, 2023: We are releasing both v9.2.1 and v8.1.7 which include security fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • January 23, 2023:The first version of the stable v9.2.x ATS branch is now available for download. This version, \ v9.2.0, is a feature and bug fix release over previous v9.1.x releases.
  • December 15, 2022: We are releasing both v9.1.4 and v8.1.6 which include security fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • August 9, 2022: We are releasing both v9.1.3 and v8.1.5 which include security fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • March 21, 2022:The latest version of the stable v8.x ATS release is now available for download. This version, v8.1.4, is a bug fix release over previous 8.x releases.
  • March 11, 2021:The latest version of the stable v9.x ATS release is now available for immediate download! This version, v9.1.2, is a bug fix release over previous 9.x releases.
  • November 2, 2021:We are releasing both v9.1.1 and v8.1.3 which include security fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • August 17, 2021:We are releasing both v9.1.0, which is our next current release.
  • June 24, 2021:We are releasing both v9.0.2 and v8.1.2 which include security fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • April 16, 2021:We are pleased to announce v9.0.1, which is bug-fix release on the v9.x LTS train.