When you access any application over internet or intranet, every HTTP request that is received by a server is responded to with an HTTP status code which is a 3 digit code, and are grouped into various different classes such as 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error) and 5xx (Server Error).
Suggested Read: 1xx, 2xx, 3xx, 4xx and 5xx HTTP Status Codes
The class of a status code can be quickly identified by its first digit. This article focuses only on identifying and troubleshooting the most commonly encountered HTTP error codes, i.e. 4xx and 5xx status codes which are as listed below:
| S.No. | Status Code | Name |
|---|---|---|
| 1 | Code = 400 | Bad request |
| 2 | Code = 401 | Authorization required |
| 3 | Code = 402 | Payment required |
| 4 | Code = 403 | Forbidden |
| 5 | Code = 404 | Not found |
| 6 | Code = 405 | Method not allowed |
| 7 | Code = 406 | Not acceptable |
| 8 | Code = 407 | Proxy authentication required |
| 9 | Code = 408 | Request Timeout |
| 10 | Code = 409 | Conflict |
| 11 | Code = 410 | Gone |
| 12 | Code = 411 | Length required |
| 13 | Code = 412 | Precondition failed |
| 14 | Code = 413 | Request entity too large |
| 15 | Code = 414 | Request URI too large |
| 16 | Code = 415 | Unsupported media type |
| 17 | Code = 416 | Request range not satisfiable |
| 18 | Code = 417 | Expectation failed |
| 19 | Code = 422 | Unprocessable entity |
| 20 | Code = 423 | Locked |
| 21 | Code = 424 | Failed dependency |
| 22 | Code = 500 | Internal server error |
| 23 | Code = 501 | Not Implemented |
| 24 | Code = 502 | Bad gateway |
| 25 | Code = 503 | Service unavailable |
| 26 | Code = 504 | Gateway timeout |
| 27 | Code = 505 | HTTP version not supported |
| 28 | Code = 506 | Variant also negotiates |
| 29 | Code = 507 | Insufficient storage |
| 30 | Code = 510 | Not extended |
If you encounter any error codes that were not mentioned in this article, feel free to discuss them in the comments!
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