The All-in-One WP Migration plugin uses All-in-One WP Migration Direct Extension to communicate with your site migration via the provided URL to import your backups. If there is an error communicating, you might get one of these errors.
Here is a complete list of HTTP error codes including their meaning:
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Code: 400 ‘Bad Request’
Message: Cannot process the request because it is malformed or incorrect.
Code: 401 ‘Unauthorized’
Message: Required authentication information is either missing or not valid for the resource.
Code: 402 ‘Payment Required’
Message: Payment for the product is required in order to proceed.
Code: 403 ‘Forbidden’
Message: Access is denied to the requested resource. The user might not have enough permission.
Code: 404 ‘Not Found’
Message: The requested resource doesn’t exist.
Code: 405 ‘Method Not Allowed’
Message: The HTTP method in the request is not allowed on the resource.
Code: 406 ‘Not Acceptable’
Message: This service doesn’t support the format requested in the Accept header. The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request.
Code: 407 ‘Proxy Authentication Required’
Message: Proxy authentication required. The client must first authenticate themselves with the proxy.
Code: 408 ‘Request Timeout’
Message: Request timed out. The server timed out waiting for the request. The client did not produce a request within the time that the server was prepared to wait. Repeat the request without modifications at any later time.
Code: 409 ‘Conflict’
Message: The current state conflicts with what the request expects. The request could not be processed because of the conflict.
Code: 410 ‘Gone’
Message: The requested resource is no longer available at the server.
Code: 411 ‘Length Required’
Message: A Content-Length based header is required on the request.
Code: 412 ‘Precondition Failed’
Message: The server does not meet one of the preconditions that the requester put on the request.
Code 413 ‘Request Entity Too Large’
Message: The request size exceeds the maximum limit.
Code 414 ‘Request-URI Too Long’
Message: Request-URI too long. The URI provided was too long for the server to process.
Code: 415 ‘Unsupported Media Type’
Message: The content type of the request is a format that is not supported by the service.
Code: 416 ‘Requested Range Not Satisfiable’
Message: The specified byte range is invalid or unavailable.
Code: 417 ‘Expectation Failed’
Message: Expectation failed. The server cannot meet the requirements of the Expect request-header field.
Code: 422 ‘Unprocessable Entity’
Message: Cannot process the request because it is semantically incorrect.
Code: 429 ‘Too Many Requests’
Message: Client application has been throttled and should not attempt to repeat the request until an amount of time has elapsed.
Code: 500 ‘Internal Server Error’
Message: There was an internal error while processing the request.
Code: 501 ‘Not Implemented’
Message: The requested feature is not implemented.
Code: 502 ‘Bad Gateway’
Message: Bad gateway. The server was acting as a gateway or a proxy and received an invalid response from the upstream server.
Code: 503 ‘Service Unavailable’
Message: The service is temporarily unavailable. You may repeat the request after a delay. There may be a Retry-After header.
Code: 504 ‘Gateway Timeout’
Message: The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
Code: 505 ‘HTTP Version Not Supported’
Message: The server does not support the HTTP protocol version used in the request.