48002: Callback URL is invalid

Twilio could not process the request because the callback URL you provided is not valid. This error occurs when a request includes a malformed URL, an unsupported scheme, or a callback value that cannot be used to deliver webhooks.

• The callback URL is malformed
• The URL uses an unsupported or invalid scheme
• The URL contains invalid characters or formatting errors
• The callback URL value is empty, truncated, or incomplete
• The request parameter that contains the callback URL was populated with the wrong value

• Confirm that the callback URL is a complete, properly formatted URL
• Use https:// for production webhook endpoints
• Check for common formatting issues such as missing hostname, missing scheme, extra spaces, or invalid characters
• Verify that you passed the callback URL in the correct request parameter for the API resource you are using
• If you generate the URL in code, log the final value before sending the request to Twilio and confirm that it matches the endpoint you expect
• Test the webhook endpoint with a public, reachable URL and confirm your application returns a valid HTTP response