404 - Not Found
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Here's a basic rundown of what a 404 actually is.
When communicating via HTTP, a server is required to respond to a request, such as a web browser's request for an HTML document (web page), with a numeric response code and an optional, mandatory, or disallowed (based upon the status code) message. In the code 404, the first "4" indicates a client error, such as a mistyped URL. The following two digits indicate the specific error encountered. HTTP's use of three-digit codes is similar to the use of such codes in earlier protocols such as FTP and NNTP.
At the HTTP level, a 404 response code is followed by a human-readable "reason phrase". The HTTP specification suggests the phrase "Not Found"[1] and many web servers by default issue an HTML page that includes both the 404 code and the "Not Found" phrase.
A 404 error is often returned when pages have been moved or deleted. In the first case, a better response is to return a 301 Moved Permanently response, which can be configured in most server configuration files, or through URL rewriting; in the second case, a 410 Gone should be returned. Because these two options require special server configuration, most websites do not make use of them.
404 errors should not be confused with DNS errors, which appear when the given URL refers to a server name that does not exist. A 404 error indicates that the server itself was found, but that the server was not able to retrieve the requested page.
Some websites report a "not found" error by returning a standard web page with a "200 OK" response code; this is known as a soft 404. Soft 404s are problematic for automated methods of discovering whether a link is broken. Some search engines, like Yahoo, use automated processes to detect soft 404s.[2] Soft 404s can occur as a result of configuration errors when using certain HTTP server software, for example with the Apache software, when an Error Document 404 (specified in a .htaccess file) is specified as an absolute path (e.g. http://example.com/error.html) rather than a relative path (/error.html).[3]
Some proxy servers generate a 404 error when the remote host is not present, rather than returning the correct 500-range code when errors such as hostname resolution failures or refused TCP connections prevent the proxy server from satisfying the request. This can confuse programs that expect and act on specific responses, as they can no longer easily distinguish between an absent web server and a missing web page on a web server that is present.
Further information:
404.2-Lockdown Policy Prevents This Request
If a request is denied because the associated ISAPI or CGI has not been unlocked, a 404.2 error is returned.
404.3-MIME Map Policy Prevents This Request
If a request is denied because a MIME map restriction is in effect, a 404.3 error is returned.
405-HTTP Verb Used to Access This Page Is Not Allowed
This HTTP code is returned when the client makes an HTTP request that contains a verb that is not allowed.
407-Initial Proxy Authentication Required by the Web Server
This error indicates that an intermediary proxy server between the HTTP client and the Web server requires some form of authentication
413-Request Entity Is Too Large
For security reasons, you can limit the size of the entity-body of an HTTP request. When an entity-body of a client request exceeds the size that is specified in the MaxRequestEntityAllowed property, the application returns a 413 error.
414-Request URL Is Too Large and Therefore Unacceptable on the Web Server
Just as the entity body of a request can be too large for the application to process, a URL can be too long for it to process also. The application returns a 414 error if this occurs.