HTTP Status Codes are codes that are returned by the server following a browser request.
These code numbers indicate whether a request was successful, or had an error.
Error status codes also specify the type of the error, such as, not found, inaccessible, or moved.
200 OK = code for successful HTTP request.
404 Not Found = code for requested page was not found.
HTTP Status Codes are grouped in numeric ranges.
| Range | Description |
|---|---|
100 - 199 |
Informational codes |
200 - 299 |
Success codes |
300 - 399 |
Redirection codes |
400 - 499 |
Client error codes |
500 - 599 |
Server error codes |
Tip: Familiarity with these codes is helpful as they play a key part in web development.
All HTTP Status Codes are listed below with a description.
Status codes that return an informational message about the request.
| Message | Description |
|---|---|
100 Continue |
Server has received the request headers and lets the client send the request body |
101 Switching Protocols |
A server switch of protocol has been asked for by the requester |
103 Checkpoint |
Displays a resumable request option to resume aborted PUT or POST requests |
Status codes that indicate a successful request.
| Message | Description |
|---|---|
200 OK |
The standard response for successful HTTP requests. |
201 Created |
The request is successful and created a new resource. |
202 Accepted |
The request is only accepted for processing but not completed. |
203 Non-Authoritative Information |
The request is successful but returns an information from another source |
204 No Content |
The request is successful without any returned content |
205 Reset Content |
The request is successful without any returned content and require the requester to refresh the document |
206 Partial Content |
The server is returning only a part of the resource due to range header sent by requester |
Status codes that are notifications related to a redirect.
| Message | Description |
|---|---|
300 Multiple Choices |
Displays a link list where the user can select a link and go to that location. |
301 Moved Permanently |
The requested page has moved to a new URL permanently |
302 Found |
The requested page has moved to a new URL temporarily |
303 See Other |
The requested page can be found under a different URL |
304 Not Modified |
The requested page has not been modified since last request |
306 Switch Proxy |
No longer used |
307 Temporary Redirect |
The requested page has moved to a new URL temporarily |
308 Resume Incomplete |
Used for resumable requests to resume aborted PUT or POST requests |
Status codes that indicate an error occured that was caused by the client.
The 404 error is a well-known error, which indicates 'page not found'.
| Message | Description |
|---|---|
400 Bad Request |
The request cannot be completed because to bad syntax |
401 Unauthorized |
The request is valid but the server is not responding. It is usually used for failed authentication |
402 Payment Required |
Reserved for future use |
403 Forbidden |
The request was valid but the server is not responding |
404 Not Found |
The requested page could not be found in the server but might be available in the future |
405 Method Not Allowed |
The request method made was not supported by the page |
406 Not Acceptable |
The server generates a response that is not accepted by the client |
407 Proxy Authentication Required |
The client is required to authenticate with the proxy before requesting |
408 Request Timeout |
The server timed out waiting for the request |
409 Conflict |
A conflict in the request happened which cannot complete it |
410 Gone |
The requested page is no longer available |
411 Length Required |
The "Content-Length" is not defined. The server will not accept the request without it |
412 Precondition Failed |
The request precondition result to false by the server |
413 Request Entity Too Large |
The server will not accept the request due to request entity being too large |
414 Request-URI Too Long |
The server will not accept the request, because the URL is too long. This may happen if a POST request is converted into GET request causing long queries |
415 Unsupported Media Type |
The server will not accept the request due to unsupported media type |
416 Requested Range Not Satisfiable |
The requester asked the server for a portion of the file which cannot be provided by the server |
417 Expectation Failed |
The server cannot meet the requirements of the Expect request-header field |
Status codes that indicate an error occurred on the server.
| Message | Description |
|---|---|
500 Internal Server Error |
A generic error message displayed when no specific error message can be used |
501 Not Implemented |
The server does not recognize the request method or cannot complete the request |
502 Bad Gateway |
The server was acting as a gateway or proxy and received an invalid response from the upstream server |
503 Service Unavailable |
The server is currently unavailable (overloaded or down) |
504 Gateway Timeout |
The server was acting as a gateway or proxy and did not receive a timely response from the upstream server |
505 HTTP Version Not Supported |
The server does not support the HTTP protocol version used in the request |
511 Network Authentication Required |
The client needs to authenticate to gain network access |
