perf(transport/http): optimize URL construction with url.URL for better performance (#3678)

Co-authored-by: huangzw <huangzw@2345.com>
Co-authored-by: Tony.Chen <zhihui_chen@foxmail.com>

transport/http/client.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"time"
 
 	"github.com/go-kratos/kratos/v2/encoding"
@@ -226,8 +227,12 @@ func (client *Client) Invoke(ctx context.Context, method, path string, args any,
 		contentType = c.contentType
 		body = bytes.NewReader(data)
 	}
-	url := fmt.Sprintf("%s://%s%s", client.target.Scheme, client.target.Authority, path)
-	req, err := http.NewRequest(method, url, body)
+	u := url.URL{
+		Scheme: client.target.Scheme,
+		Host:   client.target.Authority,
+		Path:   path,
+	}
+	req, err := http.NewRequest(method, u.String(), body)
 	if err != nil {
 		return err
 	}