reduce the number of string copy operations.

Upstream-commit: 73e79a3310f3976b61a295f45e12aead9af41962 Component: engine
2013-07-01 17:57:56 -04:00
parent 98e450c93d
commit ebb59e49d1
1 changed files with 5 additions and 3 deletions
--- a/components/engine/registry/registry.go
+++ b/components/engine/registry/registry.go
@ -116,9 +116,11 @@ func (r *Registry) setUserAgent(req *http.Request, extra ...VersionChecker) {
 	if len(r.baseVersions)+len(extra) == 0 {
 		return
 	}
-
-	userAgent := appendVersions(r.baseVersionsStr, extra...)
-	req.Header.Set("User-Agent", userAgent)
+	if len(extra) == 0 {
+		req.Header.Set("User-Agent", r.baseVersionsStr)
+	} else {
+		req.Header.Set("User-Agent", appendVersions(r.baseVersionsStr, extra...))
+	}
 	return
 }