Read http request from reader. 'status-line' and headers are certainly read. body and trailers may not be read. Read will be aborted when opts.cancel is called or any read wait to reader is over opts.readTimeout.

read http response from reader

write http body to writer. Reader without contentLength will be written by chunked encoding

write headers to writer

write http request. Host, Content-Length, Transfer-Encoding headers are set if needed

write http response to writer. Content-Length, Transfer-Encoding headers are set if needed