Using HTTP/1.1 via grpc transport is not possible, protocol error: missing status

[dalechyn]

connect-es/packages/connect/src/protocol-grpc/transport.ts

Line 146 in a8f2f22

validateTrailer(uRes.trailer, uRes.header);

This LOC checks for trailers, but when HTTP/1.1 is used no trailers are present, which always leads to protocol error: missing status error.

connect-es/packages/connect-node/src/node-universal-client.ts

Line 148 in a8f2f22

const trailer = new Headers();

I'd suggest disabling trailer validation in this case.

[timostamm]

gRPC requires HTTP trailers. For example, a streaming call could return a message, but then fail to return the next one. This error is encoded in HTTP trailers. When the trailers are missing, you'd never know that the call failed.

Because of this pitfall, we've disabled support for HTTP 1.1 with gRPC in #1279.

If you need HTTP 1.1, we recommend using the Connect protocol, or gRPC-Web. Both encode the status for streaming calls in the body, and do not need HTTP trailers.