The server responds with a specific status code for every request from a web browser. A webpage or a website sometimes experiences an error but cannot pinpoint the root cause of the phenomenon. In such a case, the web server returns an HTTP 500 error, known as an internal server error.
Out of various status codes, 5xx are the codes related to the Web Server. A first digit, 5, represents a server-side error. with the most common codes in the range of 00 to 10. They indicate that the server failed to complete the request because it encountered an error. The following is the list of 5xx errors:
| Error | Message | Description |
| 500 | Internal server error | When a server encounters an unexpected condition. |
| 501 | Not implemented | When an HTTP method sent to a server is not supported. This is a rare situation and is caused when a web server is outdated. |
| 502 | Bad gateway | When servers are configured improperly, when there is poor IP communication between back-end computers, when the client's server is overloaded, or when a firewall is functioning improperly. |
| 503 | Service unavailable | When a server is unable to handle requests due to overload or a server is closed for maintenance. |
| 504 | Gateway timeout | When a server does not receive responses in a timely manner from other servers in a chain. This might be due to slow communication amongst the chain of computers. |
| 505 | HTTP version not supported | When a server refuses to support a specific HTTP protocol defined by the client computer. |
| 506 | Variant also negotiates | When a server is configured improperly. |
| 507 | Insufficient storage | When a server is out of free memory and fails to allocate a set of free resources to run a requested service. |
| 509 | Bandwidth limit exceeded | When a server's bandwidth limit set by the admin is reached. |
| 510 | Not extended | When a server does not support the extension attached to an HTTP request. |
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