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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
Must know about chatbot
must know about developer Facebook app
must know how to resolve this webhook issue