Create a successful developer Facebook app

Create a successful developer Facebook app

I have a webbased chatbot . I have been trying to create a successful app for it on developer Facebook . But my webhook url keeps getting an error " The URL couldn't be validated. Callback verification failed with the following errors: curl_errno = 56; curl_error = Received HTTP code 502 from proxy after CONNECT; HTTP Status Code = 502; HTTP Message = Failed to resolve host" Am looking for someone to resolve this issue

---

Requirements

Must know about chatbot

must know about developer Facebook app

must know how to resolve this webhook issue

---

Skills Required

Web design chatbot Facebook app Facebook developer