HTTP Status Codes
HTTP response status codes
HTTP response status codes indicate whether a specific HTTP request has been successfully completed. It is a 3-digit integer where the first digit of the status code defines the class of response and the last two digits do not have any categorization.(HTTP - Status Codes)
Responses are grouped in five classes:
- Informational responses (100–199): It means the request has been received and the process is continuing.
- Successful responses (200–299): It means the action was successfully received, understood, and accepted.
- Redirects (300–399): It means further action must be taken in order to complete the request.
- Client errors (400–499): It means the request contains incorrect syntax or cannot be fulfilled.
- Server errors (500–599): It means the server failed to fulfill an apparently valid request.
Below is a list of some common http status codes:
Informational responses (100–199)
| Message | Description |
| 100 | everything so far is OK and that the client should continue the request as long as it has not been rejected |
| 101 | indicates that the server is switching a protocal |
Successful responses (200–299)
| Message | Description |
| 200 | The request has completed successfully |
| 201 | The request is complete, and a new resource is created |
| 202 | The request is accepted for processing, but the processing has not yet started |
| 203 | The information in the entity header is from a local or third-party copy, not from the original server(used for mirrors or backups of another resource) |
| 204 | A status code and a header are given in the response, but there is no entity-body in the reply |
| 205 | The browser should clear the form used for this transaction for additional input. |
| 206 | The server is returning partial data of the size requested |
Redirect responses (300–399)
| Message | Description |
| 300 | A link list where a user can select a link and go to that location |
| 301 | The requested page has moved to a new url |
| 302 | The requested page has moved and found at a temporary new url |
| 303 | The requested page can be found under a different url |
| 305 | The requested URL must be accessed through the proxy mentioned in the Location header |
| 307 | The requested page has moved temporarily to a new url |
Client errors (400–499)
| Message | Description |
| 400 | The server did not understand the request(bad request) |
| 401 | The requested page needs a username and a password(unauthorised) |
| 403 | Access is forbidden to the requested page |
| 404 | The server can not find the requested page |
| 405 | The method specified in the request is not allowed |
| 408 | The request took longer than the server was prepared to wait |
| 409 | The request could not be completed because of a conflict. |
| 410 | The requested page is no longer available |
Server errors (500–599)
| Message | Description |
| 500 | The request was not completed because the server encountered a situation it doesn’t know how to handle |
| 501 | The request method is not supported by the server and cannot be handled |
| 502 | The request was not completed because the server received an invalid response from the upstream server |
| 503 | The server is not ready to handle the request |
| 504 | The gateway has timed out |
| 505 | The server does not support the “http protocol” version |