Twilio sent a webhook to your server and your server responded with a 3xx status code that was not a valid redirect.
Possible Causes
Your server responded with an non-redirect HTTP status code in the 3xx series. Twilio will only follow redirects for status codes 301, 302, 303, and 307.
Your server did not include a location header in the redirect response
Possible Solutions
Update your webhook configuration specifying the final URL you would like to be called, removing the need for redirects.
Ensure you are using a standard redirect HTTP status code (301, 302, 303, or 307)
Ensure that you are including a valid url in the location header of your response.