1. https://trac.nginx.org/nginx/ticket/1083
2. https://trac.nginx.org/nginx/ticket/1388
3. HPACK Dynamic Table Size in HTTP/2
   https://http2.github.io/http2-spec/compression.html#dynamic....
4. Accept-Encoding
   The "identity" content-coding is always acceptable, unless
   specifically refused because the Accept-Encoding field includes
   "identity;q=0", or because the field includes "*;q=0" and does
   not explicitly include the "identity" content-coding. If the
   Accept-Encoding field-value is empty, then only the "identity"
   encoding is acceptable.
5. HTTP/2 prioritization is intermittent and often ineffective
   https://trac.nginx.org/nginx/ticket/1763
6. AIO kernel feature io_uring pool Linux kernel 5.1+

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