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HTTP 404 ▪ Sale

HTTP
Persistence Compression HTTPS
Request methods
OPTIONS GET HEAD POST PUT DELETE TRACE CONNECT PATCH
Header fields
Cookie ETag Location HTTP referer DNT X-Forwarded-For
Status codes
301 Moved permanently 302 Found 303 See Other 403 Forbidden 404 Not Found
v t e

The 404 or Not Found error message is a HTTP standard response code indicating that the client was able to communicate with the server, but the server could not find what was 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 link; hence the 404 error is one of the most recognizable errors users can find on the web.

A 404 error should not be confused with "server not found" or similar errors, in which a connection to the destination server could not be made at all. A 404 error indicates that the requested resource may be available again in the future; however, the fact does not guarantee the same content.

Overview [edit]

When communicating via HTTP, a server is required to respond to a request, such as a web browser's 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 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" 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.

Custom error pages [edit]

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 pages unless they are larger than 512 bytes, opting instead to display a "friendly" error page. Google Chrome includes similar functionality, where the 404 is replaced with alternative suggestions generated by Google algorithms, if the page is under 512 bytes in size.. This is a violation of RFC 2616, which states that "user agents SHOULD display any included entity to the user".

Another problem is that if the page does not provide a favicon, and a separate custom 404 page exists, extra traffic and longer loading times will be generated.

404 page widgets [edit]

While many websites send additional information in a 404 error message-such as a link to the homepage of a website or a search box-there are also much more advanced extensions available as widgets that endeavor to find the correct web page the user wanted. In Europe, the NotFound Project encourages site operators to add a snippet of code to serve customised 404 error pages which provide data about missing youngsters.

Soft 404 [edit]

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. 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).

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.

In July 2004, the UK telecom provider BT Group deployed the Cleanfeed content blocking system, which returns a 404 error to any request for content identified as potentially illegal by the Internet Watch Foundation. Other ISPs return a HTTP 403 "forbidden" error in the same circumstances. The practice of employing fake 404 errors as a means to conceal censorship has also been reported in Thailand and Tunisia. In Tunisia, where censorship is reportedly severe, people have become aware of the nature of the fake 404 errors and have created an imaginary character named "Ammar 404" who represents "the invisible censor".

In popular culture [edit]

• During the May 2011 Greek protests, one of the most popular slogans was "Error 404: Democracy not found".
• In Tunisia political censorship led to 404 becoming so ubiquitous that Tunisian bloggers invented a character called Ammar they held responsible for its deployment.
• Renny Gleeson with Weiden and Kennedy spoke at TED in 2012. Through a PIE initiative^{[clarification needed]}, Portland thinkers^[who?] have been exploring ways to improve the emotional response to a 404 page experience. Companies like Groupon, that specialize in digital consumerism, have begun to utilize their ideas in order to personalise the consumer experience when they have reached a 'dead-end' while searching through products. These examples of 404 pages could be considered "quirky" as they do not reflect the companies own strategies, but feature irrelevant items to lower the formality of the page.

Slang usage [edit]

In 2008, a study carried out by the telecommunications arm of the Post Office found that "404" had become a slang synonym for "clueless" in the United Kingdom. Slang lexicographer Jonathon Green said that "404" as a slang term had been driven by the "influence of technology" and young people, but at the time, such usage was relatively confined to London and other urban areas.

See also [edit]

• List of HTTP status codes
• Link rot

References [edit]

External links [edit]

• Hypertext Transfer Protocol -- HTTP/1.1, Status Code Definitions
• ErrorDocument Directive – instructions on custom error pages for the Apache 2.0 web server
• Help for HTTP 404 'Not Found' errors
• HTTP Error Resource

v t e Error messages Common Out of memory Infamous Abort, Retry, Fail? Bad command or file name Blue Screen of Death Can't extend HTTP 404 lp0 on fire Not a typewriter PC LOAD LETTER Humorous Halt and Catch Fire HTTP 418 HTTP 420 (parody of HTTP 429) Lists List of HTTP status codes List of FTP server return codes HTTP HTTP 403 Related Screens of Death

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Information source: wikipedia.org

Do you want to know more? Look at the full version of the HTTP 404 article.

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