fix(client): keep ref to resp to avoid conn closed

client.go

@@ -86,5 +86,6 @@ func (p *ClientUpgrader) UpgradeResponse(req *protocol.Request, resp *protocol.R
 		conn.newCompressionWriter = compressNoContextTakeover
 		conn.newDecompressionReader = decompressNoContextTakeover
 	}
+	conn.resp = resp
 	return conn, nil
 }

conn.go

@@ -282,6 +282,10 @@ type Conn struct {
 
 	readDecompress         bool // whether last read frame had RSV1 set
 	newDecompressionReader func(io.Reader) io.ReadCloser
+
+	// keep reference to the resp to make sure the underyling conn will not be closed.
+	// see: https://github.com/cloudwego/hertz/pull/1214 for the details.
+	resp interface{} // *protocol.Response
 }
 
 func newConn(conn net.Conn, isServer bool, readBufferSize, writeBufferSize int, writeBufferPool BufferPool, br *bufio.Reader, writeBuf []byte) *Conn {