"404 Not Found" redirects here. For the TV episode, see 404 Not Found (Mr. Robot).
HTTP
Persistence
Compression
HTTPS
QUIC
Request methods
OPTIONS
GET
HEAD
POST
PUT
DELETE
TRACE
CONNECT
PATCH
Header fields
Cookie
ETag
Location
HTTP referer
DNT
X-Forwarded-For
Response status codes
301 Moved Permanently
302 Found
303 See Other
403 Forbidden
404 Not Found
451 Unavailable for Legal Reasons
Security access control methods
Basic access authentication
Digest access authentication
Security vulnerabilities
HTTP header injection
HTTP request smuggling
HTTP response splitting
HTTP parameter pollution
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In computer network communications, the HTTP 404, 404 not found, 404, 404 error, page not found, or file not found error message is a hypertext transfer protocol (HTTP) standard response code, to indicate that the browser was able to communicate with a given server, but the server could not find what was requested. The error may also be used when a server does not wish to disclose whether it has the requested information.[1]
The website 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 encountered on the World Wide Web.
^Fielding, R.; Reschke, J. (June 2014). Fielding, R; Reschke, J (eds.). "RFC 7231, HTTP/1.1 Semantics and Content, Section 6.5.4 404 Not Found". ietf.org. doi:10.17487/RFC7231. S2CID 14399078. Retrieved 13 December 2018. {{cite journal}}: Cite journal requires |journal= (help)
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distinctive four green pigtails, and she appears in the HTTP404 message (leading to the nickname of "404 Girl"), along with banned user messages and banner...
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