HTTP 404

HTTP
Request methods
Header fields
Response status codes
  • 301 Moved Permanently
  • 302 Found
  • 303 See Other
  • 403 Forbidden
  • 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

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.

  1. ^ Fielding, R; Reschke, J, eds. (June 2014). "404 Not Found". HTTP/1.1 Semantics and Content. Internet Engineering Task Force (IETF). sec. 6.5.4. doi:10.17487/RFC7231. S2CID 14399078. RFC 7231. Retrieved 13 December 2018.
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