Supporting a newer L7 protocol, Traffic Server support supports HTTP/2 . Currently HTTP/2 is defined as http2 draft-16.

Current status

• Some patches are available on TS-2729
• Fundamental HTTP/2 frame handling
• Flow control
• Some error handlings

How to test

1. Build ATS codes normally. you need neither any build option nor external HTTP/2 library.
2. Configure settings to use https.
3. Add settings to records.config to use http2.

   CONFIG proxy.config.http2.enabled INT 1
   

4. Access to ATS by HTTP/2 client.

TODO

• Refactoring
  • HPACK encoder/decoder
  • Around writing HTTP/2 frames
  • Separate logic between connection level and stream level
• More debugging
• Write documents
• Add test tools for HPACK, HTTP/2 frames
  • REPL tool to test behavior of HPACK encoder/decoder
    • Enable it to load test cases from hpack-test-case
  • Add HTTP/2 integration test code to new_tsqa

No plan

• Server Push This would probably require support for Link preload?
• Stream Priority
• Alternative Services

...

for client connections as defined by https://httpwg.org/specs/rfc7540.html

TODO

• Support HTTP/2 from ATS to origin.  This is a current effort traffic by a github project.  More contributors are welcome.