package middleware import "net/http" func ContentSecurityPolicy(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { // While this value can be overridden, it can't be moved to after the next.ServeHTTP call, // because if the response writer get's closed, the headers can't be set anymore w.Header().Set("Content-Security-Policy", "default-src 'self' https://umami.me-fit.eu") next.ServeHTTP(w, r) }) }