perf: optimize the modification of rollout to httproute header

pkg/trafficrouting/network/gateway/gateway.go

@@ -135,13 +135,13 @@ func (r *gatewayController) buildDesiredHTTPRoute(rules []gatewayv1alpha2.HTTPRo
 		// according to the Gateway API definition, weight and headers cannot be supported at the same time.
 		// A/B Testing, according to headers. current only support one match
 	} else if len(matches) > 0 {
-		return r.buildCanaryHeaderHttpRoutes(rules, matches[0].Headers)
+		return r.buildCanaryHeaderHttpRoutes(rules, matches)
 	}
 	// canary release, according to percentage of traffic routing
 	return r.buildCanaryWeightHttpRoutes(rules, weight)
 }
 
-func (r *gatewayController) buildCanaryHeaderHttpRoutes(rules []gatewayv1alpha2.HTTPRouteRule, headers []gatewayv1alpha2.HTTPHeaderMatch) []gatewayv1alpha2.HTTPRouteRule {
+func (r *gatewayController) buildCanaryHeaderHttpRoutes(rules []gatewayv1alpha2.HTTPRouteRule, matchs []rolloutv1alpha1.HttpRouteMatch) []gatewayv1alpha2.HTTPRouteRule {
 	var desired []gatewayv1alpha2.HTTPRouteRule
 	var canarys []gatewayv1alpha2.HTTPRouteRule
 	for i := range rules {
@@ -161,7 +161,7 @@ func (r *gatewayController) buildCanaryHeaderHttpRoutes(rules []gatewayv1alpha2.
 		// set canary headers in httpRoute
 		for j := range canaryRule.Matches {
 			match := &canaryRule.Matches[j]
-			match.Headers = append(match.Headers, headers...)
+			match.Headers = append(match.Headers, matchs[j].Headers...)
 		}
 		canarys = append(canarys, *canaryRule)
 	}