code: func (g *Cloud) SetURLMapForTargetHTTPProxy(proxy *compute.TargetHttpProxy, urlMapLink string) error {
  	ctx, cancel := cloud.ContextWithCallTimeout()
  	defer cancel()
  
  	ref := &compute.UrlMapReference{UrlMap: urlMapLink}
  	mc := newTargetProxyMetricContext("set_url_map")
  	return mc.Observe(g.c.TargetHttpProxies().SetUrlMap(ctx, meta.GlobalKey(proxy.Name), ref))
  }
docs: // SetURLMapForTargetHTTPProxy sets the given UrlMap for the given TargetHttpProxy.