call request_uri() , send request successful and server responsed, but request_uri is blocked

[leety1984]

We use httpc:request_uri() in production environment, and has a large number of requests to call a micro-service. Sometimes we found in _chunked_body_reader function, co_yield(str) does not yield and suspend the execution： max_chunk_size = co_yield(str) or default_chunk_size then in this function: _read_body(res), coroutine is blocked in this call: local chunk, err repeat chunk, err = reader() -- blocked here

After a few senconds, Called micro-service close the connection, and we got a Close_wait status TCP coonction。 We add some debug logs, but have no further progress， Thanks