Make the ErrNothingRead to be exposed.

[wangfakang]

hello @erikdubbelboer We used the ReadLimitBody API directly to read client data, and to avoid this issue we need to check the error type, as below

……
                err := request.ReadLimitBody(conn.br, defaultMaxRequestBodySize)
                if err != nil {
                        _, errNothingRead := err.(fasthttp.ErrNothingRead)
                        if err != io.EOF && !errNothingRead {
                                // write error response
                                conn.conn.Write(buffer.NewIoBufferBytes(strErrorResponse))

                                // close connection with flush
                                conn.conn.Close(api.FlushWrite, api.LocalClose)
                        }
                   ……
                }
……

So need to exposed the ErrNothingRead erroy type, thx.

[wangfakang]

/cc @erikdubbelboer it has been done.

[erikdubbelboer]

Thanks!