I wouldn't call nginx to be mostly resilient, but at least nginx doesn't leak resources by default and has measures against some known attacks, like the one that prevents DoS from range requests. It also has some ways to make it somewhat more resilient with limit_req and limit_conn modules and handles timeouts for streaming and external requests properly. The only way for Go to get on that level is to write another networking library, the one in the standard library is pretty much broken by design (they've been working on it for many years and it's still doesn't handle even timeouts properly).