diff --git a/internal/nodes/http_client_pool.go b/internal/nodes/http_client_pool.go
index 692cf1e..a16868c 100644
--- a/internal/nodes/http_client_pool.go
+++ b/internal/nodes/http_client_pool.go
@@ -71,7 +71,7 @@ func (this *HTTPClientPool) Client(req *HTTPRequest,
 			urlPort = "443"
 		}
 
-		originHost = originHost + ":" + urlPort
+		originHost += ":" + urlPort
 	}
 
 	var rawKey = origin.UniqueKey() + "@" + originAddr + "@" + originHost