HTTP/2 stream priority

[akas...@gmail.com]

Hi,

Any ideas on whether there is any support for HTTP/2 stream priority (Section 5.3 of the HTTP/2 RFC 7540) in envoy?  Only info I could find was in this comment below. Any future plans of supporting it? 

Thanks!

source/common/http/http2/codec_impl.cc

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C++

727	nghttp2_option_new(&options_);
728	// Currently we do not do anything with stream priority. Setting the following option prevents
729	// nghttp2 from keeping around closed streams for use during stream priority dependency graph

[Matt Klein]

At the HTTP/2 connection level, priority is supported in the sense that window will be given to higher priority streams before lower priority streams.

What is not supported is proxying HTTP/2 priority from downstream to upstream. TBH I think such proxying adds a bunch of complexity and is dubiously useful, but it's definitely something we can consider adding in the future. I've added Alyssa who might have more to say on the subject.

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Matt Klein

Software Engineer

mkl...@lyft.com

https://calendly.com/mattklein123