protocols/request-response: Close response stream even if response cannot be sent (#1987)

Co-authored-by: Roman Borschel <romanb@users.noreply.github.com>
Co-authored-by: Max Inden <mail@max-inden.de>

protocols/request-response/src/handler/protocol.rs

@@ -106,6 +106,7 @@ where
                     let write = self.codec.write_response(&protocol, &mut io, response);
                     write.await?;
                 } else {
+                    io.close().await?;
                     return Ok(false)
                 }
             }