reference to https://github.com/spring-cloud/spring-cloud-gateway/issues/2169
this may need spring boot project support
Comment From: wilkinsona
Netty, like the other web servers that Spring Boot supports, doesn't start listening until the end of context refresh processing. It's triggered by a SmartLifecycle immediately before the ContextRefreshedEvent is published. As such, I don't think there's anything for us to do here. If Gateway loads it routes as part of standard refresh processing, they'll all be available before Netty starts listening. Let's see what happens with spring-cloud/spring-cloud-gateway#2169. We can re-open this issue if it turns out that there's something concrete for us to act upon.