Copy a new client inside WithRespHandler

Signed-off-by: JmPotato <[email protected]>

client/http/client.go

@@ -159,10 +159,11 @@ func (c *client) Close() {
 	log.Info("[pd] http client closed")
 }
 
-// WithRespHandler sets the client with the given HTTP response handler.
+// WithRespHandler sets and returns a new client with the given HTTP response handler.
 // This allows the caller to customize how the response is handled, including error handling logic.
 func (c *client) WithRespHandler(handler func(resp *http.Response) error) Client {
-	c.respHandler = handler
+	newClient := *c
+	newClient.respHandler = handler
 	return c
 }