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21502: Invalid callback url

ERROR: 21502

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ERROR

Error - 21502

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Invalid callback url

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The callback url provided is not a valid URL.

Possible Solutions

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Make sure you submit a fully qualified URL including:

  • protocol (http:// or https://)
  • hostname
  • file path
  • properly url-encoded query parameters

Twilio must be able to reach this URL over the public Internet.