Function RequestID

server-source-code/internal/middleware/requestid.go:15–29

RequestID returns a middleware that adds a request ID to the context.

()

// RequestID returns a middleware that adds a request ID to the context.
func RequestID() func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			id := r.Header.Get("X-Request-ID")
			if id == "" {
				b := make([]byte, 16)
				_, _ = rand.Read(b)
				id = hex.EncodeToString(b)
			}
			w.Header().Set("X-Request-ID", id)
			ctx := context.WithValue(r.Context(), RequestIDKey, id)
			next.ServeHTTP(w, r.WithContext(ctx))
		})
	}
}