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Sorted by reason phrase

The same curiosities, in alphabetical order of reason phrase.

28 curiosities on this page

  1. HTP-012 306 (Unused) The empty slot on the shelf: a number reserved for a code that never existed. Redirections (3xx) forgotten
  2. HTP-008 208 Already Reported Told you about that one — the code that avoids repeating a resource inside a 207. Success (2xx) forgotten
  3. HTP-001 100 Continue Go ahead with the rest — the server accepts the body before receiving it. Informational (1xx) common
  4. HTP-004 103 Early Hints Headers that arrive before the response, so the browser can get a head start. Informational (1xx) uncommon
  5. HTP-015 410 Gone The honest sibling of 404: it existed, it was removed for good — stop looking. Client errors (4xx) uncommon
  6. HTP-024 505 HTTP Version Not Supported I do not speak that protocol version — the rarest refusal of the five houses. Server errors (5xx) forgotten
  7. HTP-016 418 I'm a teapot The teapot that refuses to brew coffee — the 1998 joke that became heritage. Client errors (4xx) uncommon
  8. HTP-009 226 IM Used Sent only the difference — the delta response the web never adopted. Success (2xx) forgotten
  9. HTP-026 507 Insufficient Storage The disk ran out — said with its own code, courtesy of WebDAV. Server errors (5xx) uncommon
  10. HTP-027 508 Loop Detected The server walked into an infinite loop and had the honesty to say so. Server errors (5xx) forgotten
  11. HTP-017 421 Misdirected Request Right door, wrong house: this connection does not serve that domain. Client errors (4xx) uncommon
  12. HTP-007 207 Multi-Status One response carrying many: a status per resource, wrapped in XML. Success (2xx) uncommon
  13. HTP-010 300 Multiple Choices There is more than one version; you choose — says the server, and nobody chooses. Redirections (3xx) forgotten
  14. HTP-028 511 Network Authentication Required The airport wi-fi captive portal, with a status code of its own. Server errors (5xx) uncommon
  15. HTP-005 203 Non-Authoritative Information A 200 with a warning on the frame: someone touched the response on the way. Success (2xx) forgotten
  16. HTP-006 206 Partial Content Just the piece requested — the code that lets video skip to the middle. Success (2xx) common
  17. HTP-013 402 Payment Required Reserved for a future with money on the web — for almost three decades. Client errors (4xx) uncommon
  18. HTP-020 428 Precondition Required No If-Match, no deal: the code that prevents the lost update. Client errors (4xx) uncommon
  19. HTP-003 102 Processing Still working on it, said the WebDAV server — a deprecated code. Informational (1xx) forgotten
  20. HTP-014 407 Proxy Authentication Required The middleman's 401: it is the proxy demanding credentials, not the site. Client errors (4xx) uncommon
  21. HTP-022 431 Request Header Fields Too Large The headers did not fit — almost always a cookie that grew too much. Client errors (4xx) uncommon
  22. HTP-002 101 Switching Protocols The handshake that turns HTTP into something else — WebSocket, almost always. Informational (1xx) common
  23. HTP-018 425 Too Early Too soon: the server will not risk processing a request that might be a replay. Client errors (4xx) forgotten
  24. HTP-021 429 Too Many Requests Slow down: the rate limit burst, and Retry-After says when to come back. Client errors (4xx) common
  25. HTP-023 451 Unavailable For Legal Reasons Censorship with a receipt: blocked by legal demand, and the number honors Bradbury. Client errors (4xx) uncommon
  26. HTP-019 426 Upgrade Required I only answer in another protocol — and the Upgrade header says which. Client errors (4xx) forgotten
  27. HTP-011 305 Use Proxy Go through this proxy — an order browsers refused to obey. Redirections (3xx) forgotten
  28. HTP-025 506 Variant Also Negotiates The negotiation that points at itself: a misconfiguration with its own code. Server errors (5xx) forgotten