HTTP Response Codes are status messages from the server running HTTP protocol.
These HTTP status codes are classified into five categories according to the HTTP response.
1- 1xx for Informational
2- 2xx for Success
3- 3xx for Redirection
4- 4xx for Client Errors
5- 5xx for Server Errors.
| HTTP Response Codes | ||
| Information Codes | ||
| Response # | Response Code | Description |
| 100 | Continue | The request was successful. The process can now continue. |
| 101 | Switching Protocols | The request for the server to switch protocols was accepted, such as a switch from ftp to http. |
| Success Codes | ||
| Response # | Response Code | Description |
| 200 | OK | The item requested of the server is available (keep in mind, available, not accepted or completed). |
| 201 | Created | A new address has been created through the use of form posting, perl, cgi, etc. |
| 202 | Accepted | The request has been accepted (keep in mind that the request has been accepted, not completed) |
| 203 | Non-Authoritative Information | The information received is not from the server that the information was requested from, but from another source. |
| 204 | No Content | There was no content to be given for the request. For instance if you click on a hyperlink, imagemap, or button that isn’t linked to anything or doesn’t do anything. |
| 205 | Reset Content | A script has reset the displayed content. |
| 206 | Partial Content | Only partial content has been displayed. This could be due to bandwidth, poor caching, bad html, or other reasons. |
| Redirection Codes | ||
| Response # | Response Code | Description |
| 300 | Multiple choices | You will either get a choice of pages or an error message when this occurs. The address is actually pointing to two multiple files and/or locations. |
| 301 | Moved Permanently | The requested page has been permanently moved. The server will automatically redirect you to the new location. |
| 302 | Found | The requested page has been temporarily moved. The server will automatically redirect you to the new location. |
| 303 | See Other | The requested data is stored in an alternate location and the GET method will be used to retrieve the data. If the actual error is returned then this may be due to a web server misconfiguration. |
| 304 | Not Modified | The requested data has not been modified since the last request. |
| 305 | Use Proxy | The requested data may only be accessed via the use of a proxy server. |
| 307 | Temporary Redirect | The requested page has been moved. The server will automatically redirect you to the new location. Unlike Response 301 and 302 however, the server has not specified whether the move is temporary or permanent. |
| Client Error Codes | ||
| Response # | Response Code | Description |
| 400 | Bad Request | The request was denied due to a syntax error in the request. |
| 401 | Unauthorized | Your IP address or the username/password you entered were not correct. Your request was denied as you have no permission to access the data. |
| 402 | Payment Required | The data is not accessible at the time. The owner of the space has not yet paid their service provider. |
| 403 | Forbidden | Your IP address or the username/password you entered were not correct. Your request was denied as you have no permission to access the data.
OR The server was unable to serve the data that was requested. |
| 404 | Not Found | The document that has been requested either no longer exists, or has never existed on the server. |
| 405 | Method Not Allowed | The document that has been requested either no longer exists, or has never existed on the server. |
| 406 | Not Acceptable | The client (webbrowser) does not accept the document format. The formats that may be specified not to accept are charset, encoding, certain file types, languages, or ranges. |
| 407 | Proxy Authentication Required | The browser has not been authenticated on the required proxy server to access the data. This error is probably most commonly returned by content filters/parental controls. |
| 408 | Request Timeout | The server has closed the socket due to communications between the client and server taking too long. This could be due to server load, bandwidth issues, the client being disconnected from the internet, etc. |
| 409 | Conflict | Too many requests for the same file at one time.
OR This could be caused by a DNS issue |
| 410 | Gone | This is like a 404 error in that the document requested is not on the server, however this differs in that the server ‘knows’ that the file used to be there and ‘believes’ that the file may be back, so it returns 410 rather 404. |
| 411 | Length Required | When trying to send a document to the server the server did not recieve a Content-Length specification in the header. |
| 412 | Precondition Failed | A precondition setting required by the client or server has not been met. |
| 413 | Request Entity Too Large | The process is too large to process. (ie: a file you are trying to upload is too large to fit on the server, or a webpage you are trying to download is too large for the server to process) |
| 414 | Request-URI Too Large | The URL requested is simply too long. It is most likely more than 1024, 2048, or 4096 characters in length. |
| 415 | Unsupported Media Type | This usually occurs if the server does not support the type of media the client is requesting. (ie: the server does not support streaming media, but streaming media is on the server and the client is attempting to access it) |
| 416 | Requested Range Not Satisfiable | The client request included a range for acceptable file size, however the document requested did not fit into that range. |
| 417 | Expectation Failed | The client’s expect header requested certain server behaviors that the server could not perform. |
| Server Error Codes | ||
| Response # | Response Code | Description |
| 500 | Internal Server Error | The server encountered an error. This is most often caused by a scripting problem, a failed database access attempt or other similar reasons. |
| 501 | Not Implemented | The method you are using to access the document can not be performed by the server. Possible methods include:
CONNECT TRACE |
| 502 | Bad Gateway | The document requested resides on a 3rd party server and the original server received an error from the 3rd party server. |
| 503 | Service Unavailable | The server is overloaded or down for maintenance and due to this was unable to process the client request. |
| 504 | Gateway Timeout | Most likely the client has lost connectivity (disconnected from the internet) or the cleint’s host is having technical difficulties. This could also meanthat a server that allows access to the requested server is down, having bandwidth/load issues, or otherwise unavailable. |
| 505 | HTTP version not supported | The server does not support the HTTP version used by the client. (This usually occurs if the server is using an OLDER version of HTTP than the client.) |
