Status Code 5XX
Level 500 status codes are also considered errors. However, they indicate that the problem is on the server's end. This can make them harder to resolve.
500: “An error occurred on the server and the afghanistan phone number library request could not be completed.” The server encountered an unexpected condition. This is a general code that means “internal server error.” Something went wrong on the server and the requested resource was not delivered. This code is often generated by third-party plugins, faulty PHP, or even a broken database connection.
501: “Not Implemented.” This error indicates that the server does not support the functionality required to fulfill the request. This is almost always an issue with the web server itself and usually needs to be resolved by the host. The request was not completed. The server did not support the functionality required.
502: “Bad gateway.” This error code usually means that a server received an invalid response from another server, such as when a proxy server is used. Other times, a query or request takes too long and is therefore cancelled or killed by the server and the database connection is lost. The request was not completed. The server received an invalid response from the upstream server.
503: “The server is currently unable to fulfill this request.” The request cannot be completed at this time. This code may be returned by an overloaded server that is unable to handle additional requests. The request was not completed. The server is temporarily overloaded or down.
504: “The server acting as a gateway timed out waiting for another server to respond.” This is the code returned when there are two servers involved in processing a request, and the first server times out waiting for the second server to respond. The gateway timed out.
505: “HTTP version not supported.” the HTTP version the client is using to make the request.