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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.
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Proxying
Easily add keep-alive, filter or anonymize content requests, or add load balancing by adding a proxy layer.
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Fast
Scales well on modern SMP hardware, handling 10s of thousands of requests per second.
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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.
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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.
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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.
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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.
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Report or confirm bugs or try out the latest patches from our Bug Tracker
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Learn how to ask good questions, create useful bug reports and how to apply patches.
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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.
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Impress developers or help others by participating on our dev discussion list or follow the latest development on our commits list.
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Report issues or bring patches to our Bug Tracker
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Visit our wiki to see a list of Projects we are currently working on.
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Learn how to create patches to the code or the documentation and how to debug Apache Traffic Server.
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We've tagged github issues that have a low entrance barrier.
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Administrator's Guide
Installing, configuring and administrating Apache Traffic Server
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Developer's Guide
Developing Apache Traffic Server plug-ins and how the code works
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Frequently Asked
Questions
A running list of your most common questions
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Wiki
and Our blog
Collaboration and interesting topics around the project
- August 13, 2025The first minor version of ATS 10 is released: v10.1.0!
- June 17, 2025We are releasing version v10.0.6 and v9.2.11 which include security fixes and improvements. We recommend everyone to upgrade to one of these versions of ATS.
- April 2, 2025We are releasing version v10.0.5 and v9.2.10 which include security fixes and improvements. We recommend everyone to upgrade to one of these versions of ATS.
- March 5, 2025We are releasing version v10.0.4 and v9.2.9 with several bugfixes and improvements.
- January 31, 2025We are releasing version 9.2.8 with several bugfixes and improvements
- January 31, 2025We are releasing version 10.0.3 with several bugfixes and improvements
- November 26, 2024:We are releasing version v9.2.7 with several bugfixes.
- November 12, 2024:We are releasing version v10.0.2 and v9.2.6 with several bugfixes and improvements.
- October 29, 2024:We are releasing version v10.0.1 with several bugfixes and improvements.
- August 27, 2024:The first major version of ATS 10 is released: v10.0.0.
- July 25, 2024:We are releasing both v9.2.5 and v8.1.11. We recommend everyone to upgrade to one of these versions of ATS.
- April 3, 2024:We are releasing both v9.2.4 and v8.1.10. We recommend everyone to upgrade to one of these versions of ATS.
- 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.

