HTTP Status Codes
HTTP status codes are returned by web servers to indicate the status of a request. The status code is a 3-digit code indicating the particular response. The first digit of this code identifies the class of the status code. The remaining 2 digits correspond to the specific condition within the response class. The following table outlines all status codes defined for the HTTP/1.1 draft specification outlined in
IETF rfc 2068.
1xx class - Informational
Informational status codes are provisional responses from the web server. They give the client a heads-up on what the server is doing. Informational codes do
not indicate an error condition.
| Status Code |
Description |
| 100 |
Continue |
| The continue status code tells the browser to continue sending a request to the server. |
| 101 |
Switching Protocols |
| The server sends this response when the client asks to switch from HTTP/1.0 to HTTP/1.1 |
2xx class - Successful
This class of status code indicates that the client's request was received, understood, and successful.
| Status Code |
Description |
| 200 |
Successful |
| 201 |
Created |
| 202 |
Accepted |
| 203 |
Non-Authorative Information |
| 204 |
No Content |
| 205 |
Reset Content |
| 206 |
Partial Content |
The partial content success code is issued when the server fulfills a partial GET request. This happens when the client is downloading a multi-part document or part of a larger file.
3xx class - Redirection
This code tells the client that the browser should be redirected to another URL in order to complete the request. This is
not an error condition.
| Status Code |
Description |
| 300 |
Multiple Choices |
| 301 |
Moved Permanently |
| 302 |
Moved Temporarily |
| 303 |
See Other |
| 304 |
Not Modified |
| 305 |
Use Proxy |
| 307 |
Temporary Redirect |
4xx class - Client Error
This status code indicates that the client has sent bad data or a malformed request to the server. Client errors are generally issued by the webserver when a client tries to gain access to a protected area using a bad username and password.
| Status Code |
Description |
| 400 |
Bad Request |
| 401 |
Unauthorized |
| 402 |
Payment Required |
| 403 |
Forbidden |
| 404 |
Not Found |
| 405 |
Method Not Allowed |
| 406 |
Not Acceptable |
| 407 |
Proxy Authentication Required |
| 408 |
Request Timeout |
| 409 |
Conflict |
| 410 |
Gone |
| 411 |
Length Required |
| 412 |
Precondition Failed |
| 413 |
Request Entity Too Long |
| 414 |
Request-URI Too Long |
| 415 |
Unsupported Media Type |
5xx class - Server Error
This status code indicates that the client's request couldn't be successfully processed due to some internal error in the web server. These error codes may indicate something is seriously wrong with the web server.
| Status Code |
Description |
| 500 |
Internal Server Error |
An internal server error has caused the server to abort your request. This is an error condition
that may also indicate a misconfiguration with the web server. However, the most common reason
for 500 server errors is when you try to execute a script that has syntax errors. |
| 501 |
Not Implemented |
This code is generated by a web server when the client requests a service that is not implemented
on the server. Typically, not implemented codes are returned when a client attempts to POST data
to a non-CGI (i.e., the form action tag refers to a non-executable file). |
| 502 |
Bad Gateway |
The server, when acting as a proxy, issues this response when it receives a bad response from an
upstream or support server. |
| 503 |
Service Unavailable |
The web server is too busy processing current requests to listen to a new client. This error
represents a serious problem with the web server (normally solved with a reboot). |
| 504 |
Gateway Timeout |
Gateway timeouts are normally issued by proxy servers when an upstream or support server
doesn't respond to a request in a timely fashion. |
| 505 |
HTTP Version Not Supported |
The server issues this status code when a client tries to talk using an HTTP protocol that
the server doesn't support or is configured to ignore. |
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