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.

  • 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.

  • 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 v8.1.1 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.
  • December 14, 2020:We are pleased to announce the first release of ATS v9.0.0, which is our new LTS release cycle. It's available for immediate downloads from the regular Downloads page.
  • December 2, 2020:We are releasing both v8.1.1 and v7.1.12 which include bug fixes. We recommend everyone to upgrade to one of these versions of ATS.
  • August 29, 2020:We are pleased to announce the availability of our latest stable release, v8.1.0! This is a significant bug and performance improvement over the last v8.0.x release, and this is also our current LTS train. No new release for 8.0.x is planned.