Remove content-length header

[LeonSha]

Changes

Move the patch from envoy proxy.
https://sourcegraph.com/github.com/envoyproxy/envoy@cfc514546bc0284536893cca5fa43d7128edcd35/-/blob/source/extensions/filters/http/grpc_web/grpc_web_filter.cc#L51

Verification

I tried the patch locally and check the content-length has been removed.

[johanbrandhorst]

Thanks for this contribution! Is there a specific issue this fixes?

This seems to be the rationale:

// Remove content-length header since it represents http1.1 payload size, not the sum of the h2
// DATA frame payload lengths. https://http2.github.io/http2-spec/#malformed This effectively
// switches to chunked encoding which is the default for h2.

Is there an envoy issue related to this?

[LeonSha]

Thanks for this contribution! Is there a specific issue this fixes?

This seems to be the rationale:

// Remove content-length header since it represents http1.1 payload size, not the sum of the h2
// DATA frame payload lengths. https://http2.github.io/http2-spec/#malformed This effectively
// switches to chunked encoding which is the default for h2.

Is there an envoy issue related to this?
envoyproxy/envoy#2946

[johanbrandhorst]

OK, so the issue is if we have a daisy chain of proxies where this proxy will transform a HTTP/1.1 request to HTTP/2 but not remove the content-length header, then downstream proxies that receive a HTTP/2 request with a content-length header might be confused.

Thanks!

[johanbrandhorst]

I'll merge as soon as travis has succeeded.