GetReqID returns a request ID from the given context if one is present.

NewWrapResponseWriter wraps an http.ResponseWriter, returning a proxy that allows you to hook into various parts of the response process.

PanicHandler refer to https://medium.com/@masnun/panic-recovery-middleware-for-go-http-handlers-51147c941f9 and http://www.golangtraining.in/lessons/middleware/recovering-from-panic.html.

RequestIDKey is the key that holds the unique request ID in a request context.

WrapResponseWriter is a proxy around an http.ResponseWriter that allows you to hook into various parts of the response process.