grpcwebproxy closes stream after a while

Hello,

I took normal grpc server from this issue #48 (it’s based on the example book server) to test how streams work via grpcwebproxy and added channel to emulate periodic pushes from server to client.

It works fine, but after a while (after some received updates) I got an error in the browser

POST http://localhost:8080/examplecom.library.BookService/QueryBooks net::ERR_INCOMPLETE_CHUNKED_ENCODING 200 (OK)

And grpcwebproxy output is

INFO[0014] finished streaming call                       error="rpc error: code = Canceled desc = context canceled" grpc.code=Canceled grpc.method=QueryBooks grpc.service=examplecom.library.BookService grpc.start_time="2018-09-16T16:51:12+03:00" grpc.time_ms=10001 span.kind=server system=grpc

I run grpcwebproxy as grpcwebproxy --backend_addr=localhost:9090 --run_tls_server=false

When I connect directly to the go server from the example, streams work fine without any errors.

Why grpcwebproxy cancels stream or am I do something wrong? And how can I keep stream open until next update will be send?

If you need any additional info, let me know.

Thanks for help

[KShoukry]

@Revinand You are having the same issue I was having. This solved it for me https://github.com/improbable-eng/grpc-web/issues/171#issuecomment-392220446

[Revinand]

@KShoukry thank you!