Handlers

httpx.HandlerFunc (func(r *http.Request) (Response, error)) is a custom handler type that allows you to define handlers that return a structured response and an error.

It returns an httpx.Response and an error. The httpx.Wrap helper converts it to a standard http.HandlerFunc that writes the response and handles errors for you (see Errors handling).

func (h *NoteHandler) CreateNote() http.HandlerFunc {
    return httpx.Wrap(func(r *http.Request) (httpx.Response, error) {
        // business logic
        return httpx.JSON.Created(nil), nil
    })
}

You can always use stdlib http.HandlerFunc if you prefer, and use httpx helper for response handling, but you loose error handling.