Missing support for grpc-accept-encoding

[menghanl]

https://github.com/grpc/grpc/blob/master/doc/compression.md#compression-method-asymmetry-between-peers

https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests

[jiacai2050]

@easwars any progress on this?

[dfawley]

Several things are needed for this issue:

• Set grpc-accept-encoding to full list of registered codecs (with client: set grpc-accept-encoding header based on outgoing compressor #3139 we will only include the outgoing codec)
  • Fixed by client: set grpc-accept-encoding to full list of registered compressors #5541
• Server should honor the client's grpc-accept-encoding per-stream
• Client should honor the server's latest grpc-accept-encoding header received

It's possible I've overlooked other items as well.

[dfawley]

Another consideration: we should probably allow per-client/server registries of codecs which either overrides the global registry, or adds to it and provides a separate client/server option to disable the global registry.