What do you mean by 404 error ? List of HTTP Status Codes

The HTTP 404 Not Found Error means that the webpage you were trying to reach could not be found on the server. It is a Client-side Errorw...

The HTTP 404 Not Found Error means that the webpage you were trying to reach could not be found on the server. It is a Client-side Errorwhich means that either the page has been removed or moved and the URL was not changed accordingly, or that you typed in the URL incorrectly.

The following is a list of Hypertext Transfer Protocol (HTTP) response status codes. This includes codes from IETF internet standards as well as other IETF RFCs, other specifications and some additional commonly used codes. The first digit of the status code specifies one of five classes of response; the bare minimum for an HTTP client is that it recognises these five classes. The phrases used are the standard examples, but any human-readable alternative can be provided. Unless otherwise stated, the status code is part of the HTTP/1.1 standard.

1xx Informational

100 Continue
101 Switching Protocols
102 Processing (WebDAV)

2xx Success 

200 OK 
201 Created
202 Accepted
203 Non-Authoritative Information 
204 No Content205 Reset Content
206 Partial Content207 Multi-Status (WebDAV)
208 Already Reported (WebDAV)
226 IM Used 

3xx Redirection

300 Multiple Choices
301 Moved Permanently
302 Found303 See Other 
304 Not Modified
305 Use Proxy
306 (Unused)
307 Temporary Redirect
308 Permanent Redirect (experiemental)

4xx Client Error 

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 Large
414 Request-URI Too Long
415 Unsupported Media Type
416 Requested Range Not Satisfiable
417 Expectation Failed
418 I'm a teapot (RFC 2324)
420 Enhance Your Calm (Twitter)
422 Unprocessable Entity (WebDAV)
423 Locked (WebDAV)
424 Failed Dependency (WebDAV)
425 Reserved for WebDAV
426 Upgrade Required
428 Precondition Required
429 Too Many Requests
431 Request Header Fields Too Large
444 No Response (Nginx)
449 Retry With (Microsoft)
450 Blocked by Windows Parental Controls (Microsoft)
499 Client Closed Request (Nginx) 

5xx Server Error 

500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported
506 Variant Also Negotiates (Experimental)
507 Insufficient Storage (WebDAV)
508 Loop Detected (WebDAV)
509 Bandwidth Limit Exceeded (Apache)
510 Not Extended
511 Network Authentication Required
598 Network read timeout error
599 Network connect timeout error