During an outbound call made using Plivo, an HTTP API error means that your request is unable to be processed and Plivo is unable to execute the call. In these instances, calls will not be queued and you will not be charged.
These are the error responses that you may receive during an outbound call:
- 400 — A parameter is missing or is invalid
- 401 — Authentication failed
- 404 — Resource cannot be found
- 405 — HTTP method not allowed
- 500 — Server error