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Warning 15003

WARNING - 15003

Call Progress: Warning Response to Callback URL

Got an HTTP warning in response to the callback URL.

考えられる原因

  • アプリケーションが 4xx または 5xx の HTTP レスポンスを Twilio に返しました。

考えられる解決策

Ensure your application responds to callbacks with:

  • 200 OK
  • Content-Type: text/xml
  • Valid TwiML

Or respond with 204 No Content and an empty response body.

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