Etymologie, Etimología, Étymologie, Etimologia, Etymology, (griech.) etymología, (lat.) etymologia, (esper.) etimologio
@_ Welt, Mundo, Monde, Mondo, World, (lat.) orbis (terrae), (esper.) mondo
Zahlen, Número, Nombre, Numero, Number, (esper.) nombroj, nombroteorio
, lat. "quadringenti"
Zahl 00404 in Alltag und Sprache

404 (W3)

• 404 Error Pages | Overview | HTTP Status Code | Origin of Status Codes | List of Status Codes | Meaning of 404 | Content of a 404 Error Page | Soft 404s | 404 Error Percentages | Tracking and Preventing 404 Errors | Using Log Files | Using Redirects | Using robots.txt File | Customization of 404 Error Pages | Qualities of A Good 404Error Page | Forcing Internet Explorer to Display Your Custom 404
• Tutorial - Custom 404 Error Page | Step 1: Create a Customized 404 File Not Found Error Page | Step 3: Upload Both Files | Step 4: Test the Page | Common Errors
• Examples of 404 Error Pages | Examples of 404 Error Pages | Creative 404 Error Pages | Efficient 404 Error Pages | Commercial 404 Error Pages | Funny 404 Error Pages | Weird 404 Error Pages

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Origin of Status Codes

As a part of the HTTP 0.9 specifications, the World Wide Web Consortium (W3C) established HTTP status codes in 1992. Tim Berners-Lee, who invented the web and the first web browser in 1990, defined the status codes.
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What do the numbers mean?

Let's dissect 404.

The first 4 indicates a client error. The server is saying that you've done something wrong, such as misspell the URL or request a page which is no longer there. Conversely, a 5xx error indicates a server-side problem. It also indicates an error which may be transient; if you try it again, it may work.

The middle 0 refers to a general syntax error. This could indicate a spelling mistake.

The last 4 just indicates the specific error in the group of 40x, which also includes 400: Bad Request, 401: Unauthorized, etc.

"Room 404" asserts that 404 was named after a room at CERN (if you read about Tim Berners-Lee above, you'll know that that's where the web began) where the original web servers were located. However, Tom S. tells us:

"Having visited CERN myself, I can tell you that "Room 404" is not on the fourth floor - the CERN office numbering system doesn't work like that - the first digit usually refers to the *building* number (ie. building 4), and the second two to the office number. But, strangely, there is no room "04" in building "4", the offices start at "410" and work upwards - don't ask me why. Sorry to disappoint you all, but there is no Room 404 in CERN - it simply doesn't exist, and certainly hasn't been preserved as "the place where the web began". In fact, there *is* a display about this, including a model of the first NeXT server, but the whole "Room 404" thing is just a myth."

According to the W3C, 404 Not Found is only supposed to be used in cases where the server cannot find the requested location and is unsure of its status. If a page has permanently been deleted, it is supposed to use 410: Gone to indicate a permanent change. But has anyone ever seen 410? It must be 404...
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• blimp 404: oh, the humanity! There are lots more where this came from: Area 404.
• Links to the best 404 Not Found errors on the web, researched and categorized for your surfing enjoyment. Add yours!
• Make sure your site's visitors get where they need to go. How to make your own 404 page, plus other tips and hints.
• A Loving Tribute to 404 Not Found.
• Our research has shown that up to 70% of the 404s you encounter can be corrected. Here are some tricks that will make you a 404 conqueror.
• The strange and sometimes scandalous history of 404. What you see here will shock and amaze you.

404 error

Presented by Kel Richards

One of the most common verbal signals you’ll encounter on the Internet is that ominous phrase “404 error - file not found”...

Now (because of those dummies in room 404) we now get “404 error” signals on our PCs.

...This number 404 was, apparently, not chosen at random.

The story goes that the response “file not found” was first sent out as a reply to a faulty enquiry by staff in room 404 at the CERN laboratory in Switzerland, where the Web was originally devised.

The man who devised the web (British computer scientist Tim Berners-Lee) intended it merely meant to be a way for particle physicists to share information.

Now (because of those dummies in room 404) we now get “404 error” signals on our PCs. And “404” has taken on extended applications, as in: “You’re got a 404 look on your face” (meaning “you look blank and confused”).

Anyone who is noticeably uninformed is called “a 404”.

And it’s now a verb: if you’re making no progress then you’re “404-ing”.

404 | 404 compliant

"404 Not found" es el mensaje ominoso que nos devuelve el servidor cuando la página web que hemos solicitado no se encuentra en él. No es el único mensaje numérico de la Web: también tenemos el "401 Unauthorized" que nos informa de que no tenemos permiso para entrar en determinado sitio. Estos códigos fueron fijados en 1992 por Tim Berners-Lee, creador de la WWW, cuando escribió el protocolo original, y algunos fueron tomados de otro protoclo de transferencia de ficheros: el FTP (lo cuenta el Glosario básico inglés español para usuarios de Internet de la ATI, que alcanza ahora su cuarta edición: http://www.ati.es).
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404 | 404 compliant

404

Aller à : Navigation, rechercher

nombre. [web]. Code d'erreur HTTP (et, par extension, nom du document la présentant) souvent rencontré sur le Web : il vous informe que le document auquel vous tentez d'accéder est introuvable.

Par extension, 404 qualifie aussi parfois une ressource (document, pièce détachée...) introuvable, ou quelqu'un qui ne sait rien (ou pas grand chose) ou n'est que rarement présent. T'es un 404 ou quoi ?

Aussi surnommée « Erreur Peugeot », en référence au mode de numérotation des modèles de la marque.

Voici les codes d'état ou d'erreur HTTP les plus courants :

• 100 - correct, continuez à formuler votre requête
• 200 - correct (fin de traitement)
• 201 - correct, document créé
• 202 - correct, résultat non garanti
• 203 - correct, résultat fourni mais sa source n'est pas certifiée
• 204 - correct, pas d'information fournie en retour
• 205 - correct, document courant obsolète
• 206 - correct, seuls certains éléments de la requête furent transmis
• 300 - correct, toutefois le document existe sous plusieurs formes
• 301 - déplacé (autre URL) définitivement
• 302 - déplacé temporairement
• 303 - voici l'URI où se trouve le document convoité
• 304 - document non modifié depuis l'accès précédent
• 305 - demander le document au proxy dont voici l'URI
• 306 - ((n'est plus utilisé, réservé))
• 307 - redirection temporaire (n'y accéder qu'après confirmation par l'usager)
• 400 - requête incompréhensible
• 401 - non autorisé
• 402 - accès payant
• 403 - accès interdit
• 404 - document introuvable
• 405 - méthode d'accès inadéquate
• 407 - authentification proxy exigée
• 408 - la requête n'a pas été reçue dans le temps imparti (timeout)
• 409 - requête inadéquate (elle recèle des éléments incompatibles)
• 410 - comme 404, mais précise que le document a été délibéremment retiré et ne sera plus accessible
• 500 - erreur serveur
• 501 - le serveur ne peut honorer la requête
• 502 - le serveur agit pour le compte d'un autre (en tant que passerelle ou proxy) et a reçu de ce dernier une réponse incompréhensible
• 503 - service indisponible, vraisemblablement temporairement
• 504 - le serveur agit pour le compte d'un autre (en tant que passerelle ou proxy) et n'a pas reçu à temps (timeout) la réponse du serveur
• 505 - version HTTP non reconnue

35 Entertaining 404 Error Pages

404 | Not Found 404

Pourquoi une 'Erreur 404' lorsqu'une page n'est pas trouvée sur internet ?

404 - Not Found - The server was unable to locate the URL.

Some content management systems send 404 status codes when documents do exist. Ensure files that exist do give a 200 status code and requests for files that do not exist give a 404 status code. You may also want to check with your host to see if you can set up a custom 404 error page which makes it easy for site visitors to

• view your most popular and / or most relevant navigational options
• report navigational problems within your site

Search engines request a robots.txt file to see what portions of your site they are allowed to crawl. Many browsers request a favicon.ico file when loading your site. While neither of these files are necessary, creating them will help keep your log files clean so you can focus on whatever other errors your site might have.

10.4.5 - 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address. This status code is commonly used when the server does not wish to reveal exactly why the request has been refused, or when no other response is applicable.

Check Server Headers - 404 HTTP Status Code Checker
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404: Not Found: Das Dokument wurde nicht gefunden, d.h. der Link ist falsch oder die Datei wurde gelöscht.

404.html- Seite nicht gefunden

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address. This status code is commonly used when the server does not wish to reveal exactly why the request has been refused, or when no other response is applicable.

Web Server Error Messages

Errors on the Internet, and those annoying error messages, occur quite frequently -- and can be quite frustrating, especially if you do not know the difference between a "404" error and a "502" error. Many times they have more to do with the Web servers you're trying to access rather than something being wrong with your computer. Here is a list of error messages you might encounter while surfing the Web and their respective meanings to help you figure out just what the problem is.
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404 File Not Found

Server cannot find the file you requested. File has either been moved or deleted, or you entered the wrong URL or document name. Look at the URL. If a word looks misspelled, then correct it and try it again. If that doesn't work backtrack by deleting information between each backslash, until you come to a page on that site that isn't a 404. From there you may be able to find the page you're looking for.
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Acid3 Browser Test

Acid3 is the third in a series of test pages written to help browser vendors ensure proper support for web standards in their products.

Acid3 is primarily testing specifications for “Web 2.0? dynamic Web applications. Also there are some visual rendering tests, including webfonts. Here is the list of specifications tested:
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HTTP (Content-Type, 404, …)
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No 404s

computerwoche.de
Webseite nicht gefunden
Die lustigsten 404-Fehlerseiten im Netz

25.08.2013
von Damian Robota

Bei einem 404-Fehler im Internet bekommt der Besucher normalerweise eine Standardfehlerseite des Webservers angezeigt. Doch es geht auch anders. Wir haben kreative und lustige 404-Fehlerseiten im Netz zusammengetragen.

404-Fehlerseiten gibt es bereits seit dem Start des Internets. Jeder Nutzer kennt sie, fast jeden nerven sie. URLs von Webseiten die es nicht gibt, die nicht mehr da sind oder falsch verlinkt wurden, führen zu einer 404-Fehlerseite. Individuell gestaltete Fehlerseiten können jedoch dabei helfen, dass der Besucher nicht direkt die aufgerufene Seite wieder verlässt. Immer mehr Webadministratoren nutzen diese Chance und zeigen dabei, dass ein 404-Fehler durchaus lustig sein kann.

Die ideale Fehlerseite sollte dem Nutzer kurz erklären, wieso er in diesem Moment nicht das sieht, was er eigentlich erwartet hat. Eine Seitennavigation kann dabei helfen, dass der Besucher zumindest weiter auf der Seite bleibt. Die perfekte 404-Fehlerseite tröstet den Nutzer zudem mit witzigen Sprüchen, Animationen oder sogar mit einem kleinen Spiel für Zwischendurch.

Animierte Mondlandung und „Snake“-Spiel

Neben lustigen Sprüchen und Bildern auf 404-Fehlerseiten nutzen immer mehr Webmaster die Gelegenheit animierte Seiten zu erstellen. Auf blue-leaf.co.uk wird dem Besucher beispielsweise statt der klassischen Fehlermeldung eine animierte Mondlandung gezeigt. Zu lesen ist der berühmte Text „Houston, we have a problem“ sowie „Return to Base“. So gelangt der Besucher mit nur einem Klick zurück zur Startseite und verlässt die Fehlerseite sicher mit einem Lächeln. Auf den 404-Fehlerseiten von rachatdemobile.com kann man sogar den bekannten Nokia-Spieleklassiker „Snake“ im Browser spielen.

Wer denkt, dass 404-Fehlerseiten immer nur nervend sind, den belehrt unsere Bildergalerie mit den intelligentesten und lustigsten Fehlerseiten eines Besseren

moved to Atlanta (W3)

Term: "Moved to Atlanta" Definition: "When following a link results in the 404, page not found error, the now-missing page should be said to have moved to Atlanta. The area code there is 404, you see."

Want to know the difference between a 404 error and a 502 error?