web/server.go
func (mux *LoggingServeMux) HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) {
	mux.serveMux.Handle(pattern, http.HandlerFunc(handler))
}
func (mux *LoggingServeMux) HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) {
	mux.serveMux.Handle(pattern, http.HandlerFunc(handler))
}
// HandleFunc registers the handler function for the given pattern.