HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Status codes are issued by a server in response to a client’s request made to the server. Responses are grouped into five classes:

  1. Informational responses (100–199)
  2. Successful responses (200–299)
  3. Redirects (300–399)
  4. Client errors (400–499)
  5. Server errors (500–599)

1XX – Informational responses

  • 100 Continue
  • 101 Switching Protocols
  • 102 Processing (WebDAV; RFC 2518)
  • 103 Early Hints (RFC 8297)

2XX – Successful responses

  • 200 OK
  • 201 Created
  • 202 Accepted
  • 203 Non-Authoritative Information (since HTTP/1.1)
  • 204 No Content
  • 205 Reset Content
  • 206 Partial Content (RFC 7233)
  • 207 Multi-Status (WebDAV; RFC 4918)
  • 208 Already Reported (WebDAV; RFC 5842)
  • 226 IM Used (RFC 3229)

3XX – Redirects

  • 300 Multiple Choices
  • 301 Moved Permanently
  • 302 Found (Previously “Moved temporarily”)
  • 303 See Other (since HTTP/1.1)
  • 304 Not Modified (RFC 7232)
  • 305 Use Proxy (since HTTP/1.1)
  • 306 Switch Proxy
  • 307 Temporary Redirect (since HTTP/1.1)
  • 308 Permanent Redirect (RFC 7538)

4XX – Client errors

  • 400 Bad Request
  • 401 Unauthorized (RFC 7235)
  • 402 Payment Required
  • 403 Forbidden
  • 404 Not Found
  • 405 Method Not Allowed
  • 406 Not Acceptable
  • 407 Proxy Authentication Required (RFC 7235)
  • 408 Request Timeout
  • 409 Conflict
  • 410 Gone
  • 411 Length Required
  • 412 Precondition Failed (RFC 7232)
  • 413 Payload Too Large (RFC 7231)
  • 414 URI Too Long (RFC 7231)
  • 415 Unsupported Media Type (RFC 7231)
  • 416 Range Not Satisfiable (RFC 7233)
  • 417 Expectation Failed
  • 418 I’m a teapot (RFC 2324, RFC 7168)
  • 421 Misdirected Request (RFC 7540)
  • 422 Unprocessable Entity (WebDAV; RFC 4918)
  • 423 Locked (WebDAV; RFC 4918)
  • 424 Failed Dependency (WebDAV; RFC 4918)
  • 425 Too Early (RFC 8470)
  • 426 Upgrade Required
  • 428 Precondition Required (RFC 6585)
  • 429 Too Many Requests (RFC 6585)
  • 431 Request Header Fields Too Large (RFC 6585)
  • 451 Unavailable For Legal Reasons (RFC 7725)

5XX – Server errors

  • 500 Internal Server Error
  • 501 Not Implemented
  • 502 Bad Gateway
  • 503 Service Unavailable
  • 504 Gateway Timeout
  • 505 HTTP Version Not Supported
  • 506 Variant Also Negotiates (RFC 2295)
  • 507 Insufficient Storage (WebDAV; RFC 4918)
  • 508 Loop Detected (WebDAV; RFC 5842)
  • 510 Not Extended (RFC 2774)
  • 511 Network Authentication Required (RFC 6585)