I can't comment on the nginx codebase, but I've been running golang production-facing golang servers for a long time and I feel safe in saying I have mostly resilient http services.

I've worked with more than one company handling over 100k requests/s on the public internet with Go. Go's networking model combined with the work that's gone into fuzzing the stdlib combined with the benefit of hindsight when it comes to data structures and security combined with lots of love from google web people has resulted in an extremely mature web stack.