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Status codes 301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons v t e The 404 or Not Found error message is a Hypertext Transfer Protocol (HTTP) standard response code, in computer network communications, to indicate that the client error 401 was able to communicate with a given server, but the server could not find what was 404 page template requested. The web site hosting server will typically generate a "404 Not Found" web page when a user attempts to follow a broken or dead
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link; hence the 404 error is one of the most recognizable errors encountered on the World Wide Web. Contents 1 Overview 2 Custom error pages 2.1 Tracking/Checking 404 errors 3 Phony 404 errors 4 404 substatus error codes defined by IIS https://support.microsoft.com/en-us/kb/248033 4.1 Slang usage 5 See also 6 References 7 External links Overview[edit] When communicating via HTTP, a server is required to respond to a request, such as a web browser request for a 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 digit indicates a client error, such as a mistyped Uniform Resource Locator (URL). The following two digits indicate the specific error encountered. HTTP's use https://en.wikipedia.org/wiki/HTTP_404 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, it is better to employ URL mapping or URL redirection by returning 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. Custom error pages[edit] The Wikimedia 404 message Web servers can typically be configured to display a customised 404 error page, including a more natural description, the parent site's branding, and sometimes a site map, a search form or 404 page widget. The protocol level phrase, which is hidden from the user, is rarely customized. Internet Explorer, however, will not display custom
the new WordPress Code Reference! Creating an Error 404 Page Languages: English • 日本語 • (Add your language) While you work hard to make sure that every link actually goes to a specific web page on your site, there is always a chance that a link https://codex.wordpress.org/Creating_an_Error_404_Page clicked will slam dunk and become a famous 404 ERROR PAGE NOT FOUND. All is not lost. If your visitors encounter an error, why not be a helpful WordPress site administrator and present them with a message more useful than "NOT FOUND". This lesson will teach you how to edit your "error" and "page not found" messages so they are more helpful to your visitors. We'll also show how to ensure your web server displays error 404 your helpful custom messages. Finally, we'll go over how to create a custom error page consistent with your Theme's style. Contents 1 An Ounce of Prevention 2 Understanding Web Error Handling 3 Editing an Error 404 Page 4 Creating an Error 404 Page 5 Tips for Error Pages 5.1 Writing Friendly Messages 5.2 Add Useful Links 6 Testing 404 Error Messages 7 Help Your Server Find the 404 Page 8 Questions About Error Files An error found information Ounce of Prevention Some errors are avoidable, you should regularly check and double check all your links. Also, if you are deleting a popular but out-of-date post, consider deleting the body of the post, and replacing it with a link referring visitors to the new page. Understanding Web Error Handling Visitors encounter errors at even the best websites. As site administrator, you may delete out-of-date posts, but another website may have a link to your inside page for that post. When a user clicks on a link to a missing page, the web server will send the user an error message such as 404 Not Found. Unless your webmaster has already written custom error messages, the standard message will be in plain text and that leaves the users feeling a bit lost. Most users are quite capable of hitting the back key, but then you've lost a visitor who may not care to waste their time hunting for the information. So as not to lose that visitor, at the very least, you'll want your custom message to provide a link to your home page. The friendly way to handle errors is to acknowledge the error and help them find their way. This involves creating a custom Error Page or editing the one that came with your WordPress Theme. Editing an Error 404 Page Eve