Xray-core: More robust browser header masquerading (chrome, firefox, edge) (#5802)

Fixes https://github.com/XTLS/Xray-core/issues/5800

transport/internet/reality/reality.go

@@ -223,7 +223,7 @@ func UClient(c net.Conn, config *Config, ctx context.Context, dest net.Destinati
 				if req == nil {
 					return
 				}
-				req.Header.Set("User-Agent", utils.ChromeUA)
+				utils.TryDefaultHeadersWith(req.Header, "nav")
 				if first && config.Show {
 					fmt.Printf("REALITY localAddr: %v\treq.UserAgent(): %v\n", localAddr, req.UserAgent())
 				}