The callback url provided is not a valid URL.
Make sure you submit a fully qualified URL including:
Twilio must be able to reach this URL over the public Internet.
We are always striving to improve our documentation quality,
and your feedback is valuable to us.
How could this documentation serve you better?
We all do sometimes; code is hard. Get help now from our
support team, or lean on
the wisdom of the crowd browsing the
Twilio tag on Stack Overflow.