HTTP Status Codes
HTTP status code reference — searchable list of all standard 1xx–5xx codes with names and plain-English descriptions, free online.
1xx — Informational
| 100 | Continue | The server received the request headers; the client may send the body. |
| 101 | Switching Protocols | The server agrees to switch protocols (e.g. to WebSocket). |
| 102 | Processing | WebDAV: the request was received but processing is not finished. |
| 103 | Early Hints | Send preliminary headers (e.g. Link preload) before the final response. |
2xx — Success
| 200 | OK | The request succeeded; the body contains the result. |
| 201 | Created | A new resource was created (typical for POST/PUT). |
| 202 | Accepted | The request was accepted for async processing; no result yet. |
| 203 | Non-Authoritative Information | A proxy modified the origin response headers. |
| 204 | No Content | Success, but no response body. |
| 205 | Reset Content | Success; the client should reset the document view. |
| 206 | Partial Content | Response to a Range request with a part of the resource. |
| 207 | Multi-Status | WebDAV: per-resource status in a single XML body. |
| 208 | Already Reported | WebDAV: collection members already listed, not repeated. |
| 226 | IM Used | Delta-encoding applied to the resource instance. |
3xx — Redirection
| 300 | Multiple Choices | Several representations available; client picks one. |
| 301 | Moved Permanently | Resource permanently relocated; update bookmarks/SEO to Location. |
| 302 | Found | Temporary redirect to the Location header. |
| 303 | See Other | Fetch the result at Location with GET (post/redirect/get). |
| 304 | Not Modified | Conditional GET: cached version is still valid. |
| 305 | Use Proxy | Deprecated. |
| 307 | Temporary Redirect | Redirect keeping the same method and body. |
| 308 | Permanent Redirect | Permanent redirect keeping the same method and body. |
4xx — Client error
| 400 | Bad Request | Malformed syntax or invalid request framing. |
| 401 | Unauthorized | Authentication required or credentials invalid. |
| 402 | Payment Required | Reserved; used by some APIs for billing limits. |
| 403 | Forbidden | Authenticated or not — the server refuses the action. |
| 404 | Not Found | No resource at this URL (or it is hidden). |
| 405 | Method Not Allowed | The HTTP method is not supported for this resource. |
| 406 | Not Acceptable | No representation matches the Accept headers. |
| 407 | Proxy Authentication Required | Authenticate with the proxy first. |
| 408 | Request Timeout | The client took too long to send the request. |
| 409 | Conflict | Request conflicts with resource state (e.g. edit conflict). |
| 410 | Gone | The resource is permanently deleted (unlike 404, intentional). |
| 411 | Length Required | Content-Length header is required. |
| 412 | Precondition Failed | An If-* precondition header was not met. |
| 413 | Content Too Large | Request body exceeds the server limit. |
| 414 | URI Too Long | The request URI exceeds the server limit. |
| 415 | Unsupported Media Type | Content-Type of the body is not supported. |
| 416 | Range Not Satisfiable | The Range header cannot be fulfilled. |
| 417 | Expectation Failed | The Expect: 100-continue requirement cannot be met. |
| 418 | I'm a Teapot | RFC 2324 joke — this server is a teapot. |
| 421 | Misdirected Request | Request sent to a server unable to produce a response. |
| 422 | Unprocessable Content | Well-formed request, but semantic errors (validation). |
| 423 | Locked | WebDAV: the resource is locked. |
| 424 | Failed Dependency | WebDAV: failed because a dependency failed. |
| 425 | Too Early | Refuse to replay — protects against early-data replay. |
| 426 | Upgrade Required | Client must switch protocol (e.g. TLS, HTTP/2). |
| 428 | Precondition Required | Conditional headers required to prevent lost updates. |
| 429 | Too Many Requests | Rate limiting kicked in; see Retry-After. |
| 431 | Request Header Fields Too Large | Headers too big (collectively or individually). |
| 451 | Unavailable For Legal Reasons | Blocked by legal demand (named after Fahrenheit 451). |
5xx — Server error
| 500 | Internal Server Error | Generic server-side failure. |
| 501 | Not Implemented | The method is not supported by the server. |
| 502 | Bad Gateway | The upstream server returned an invalid response. |
| 503 | Service Unavailable | Overloaded or down for maintenance; see Retry-After. |
| 504 | Gateway Timeout | The upstream server did not respond in time. |
| 505 | HTTP Version Not Supported | The HTTP version is not supported. |
| 506 | Variant Also Negotiates | Content negotiation circular reference. |
| 507 | Insufficient Storage | WebDAV: server cannot store the representation. |
| 508 | Loop Detected | WebDAV: infinite loop while processing. |
| 510 | Not Extended | Further extensions to the request are required. |
| 511 | Network Authentication Required | Captive portal: authenticate to gain network access. |
About HTTP Status Codes
A searchable reference of every standard HTTP status code, grouped by class — informational, success, redirection, client error and server error.
Filter by number, name or description to quickly answer “what does 418 mean?” while debugging APIs.