List of HTTP Status Codes

Have you ever wondered about the numbers that you have found on some websites like ERROR 404?
Those numbers mean something and tell you the reason what's with the page.

Here's the complete list of the codes.

CODE 1XX (Informational)
100 Continue  This means you computer has sent the request to the server (header) and the server receives it. Thus the server demands your next request (body).
101 Switching Protocols You, as the requester has asked the server to change the protocol.

CODE 2XX (Success)
200 OK Action completed successfully, a standard successful response from HTTP.
201 Created Your request has been received and a new resource will be prepared.
202 Accepted The request has been accepted for processing, but the processing has not been completed.
203  Non Authoritative Information Partial Information Response to a GET command, indicates that the returned meta information is from a private overlaid web.
204 No Content Server has received the request but there is no information to send back.
205 Reset Content  The server has processed the content but is not sending it back to you.
206 Partial Content The requested file was partially sent.   Usually caused by stopping or refreshing a web page.

CODE 3XX (Redirection)
300 Multiple Choices
301 Moved Permanently Requested a directory instead of a specific file.   The web server added the filename index.html, index.htm, home.html, or home.htm to the URL.
302 Moved Temporarily
303 See Other    It should be assumed that the server has received the data and the redirect should be issued with a separate GET message.
304 Not Modified The cached version of the requested file is the same as the file to be sent.
305 Use Proxy  The requested resource requires a proxy.

CODE 4xx (Client Error)
400 Bad Request The request had bad syntax or was impossible to be satisified.
401 Unauthorized You have failed to enter the valid username/password or other that is required by the site
402 Payment Required  For future use, like micropayment.
403 Forbidden Your request has been denied because you don't have permission.
404 Not Found The requested file was not found, the page you are looking for in a site does not exist.
405 Method Not Allowed
406 Not Acceptable
407 Proxy Authentication Required  
408 Request Time-Out
409 Conflict    
410 Gone
411 Length Required  
412 Precondition Failed
413 Request Entity Too Large  
414 Request-URL Too Large
415 Unsupported Media Type

CODE 5XX (Server Error)
500 Server Error This error might be a result of a problem with the code or program you are calling rather than with the web server itself.
501 Not Implemented The server does not support the facility required.
502 Bad Gateway  
503 Out of Resources The server cannot process the request due to a system overload.  This should be a temporary condition.
504 Gateway Time-Out The service did not respond within the time frame that the gateway was willing to wait.
505 HTTP Version not supported  The server does not support the HTTP you have requested.
509 Bandwidth Limit Exceeded    The resource you have requested does not have bandwidth left.