HTTP Status Codes Guides

The knowledge combined here comes from RFCs, mailing lists, bug reports, code repositories, Q&A forums, and hard-won life experiences (as opposed to copying and pasting RFCs without any value add).

Guides are written from the developer/webmaster perspective.

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Informational (1xx)

These status codes indicate that the request was received while processing is still continuing.

• HTTP 100 - Continue
• HTTP 101 - Switching Protocols
• HTTP 103 - Early Hints

Success (2xx)

These status codes indicate the request was successfully understood and accepted by the server.

• HTTP 200 - OK
• HTTP 201 - Created
• HTTP 202 - Accepted
• HTTP 203 - Non-Authoritative Information
• HTTP 204 - No Content
• HTTP 205 - Reset Content
• HTTP 206 - Partial Content

Redirection (3xx)

These status codes indicate the client should take an additional step to complete the request.

• HTTP 300 - Multiple Choices
• HTTP 301 - Moved Permanently
• HTTP 302 - Found
• HTTP 303 - See Other
• HTTP 304 - Not Modified
• HTTP 307 - Temporary Redirect
• HTTP 308 - Permanent Redirect

Client errors (4xx)

These status codes are reserved for cases when the error is caused by the client.

• HTTP 400 - Bad Request
• HTTP 401 - Unauthorized
• HTTP 402 - Payment Required
• HTTP 403 - Forbidden
• HTTP 404 - Not Found
• HTTP 405 - Method Not Allowed
• HTTP 406 - Not Acceptable
• HTTP 407 - Proxy Authentication Required
• HTTP 408 - Request Timeout
• HTTP 409 - Conflict
• HTTP 410 - Gone
• HTTP 411 - Length Required
• HTTP 412 - Precondition Failed
• HTTP 413 - Request Entity Too Large
• HTTP 414 - Request URI Too Long
• HTTP 415 - Unsupported Media Type
• HTTP 416 - Range Not Satisfiable
• HTTP 417 - Expectation Failed
• HTTP 418 - I’m a Teapot
• HTTP 421 - Misdirected Request
• HTTP 422 - Unprocessable Entity
• HTTP 425 - Too Early
• HTTP 426 - Upgrade Required
• HTTP 428 - Precondition Required
• HTTP 429 - Too Many Requests
• HTTP 431 - Request Header Fields Too Large
• HTTP 451 - Unavailable For Legal Reasons

Server errors (5xx)

These status codes are reserved for cases when the problem originates from the server.

• HTTP 500 - Internal Server Error
• HTTP 501 - Not Implemented
• HTTP 502 - Bad Gateway
• HTTP 503 - Service Unavailable
• HTTP 504 - Gateway Timeout
• HTTP 505 - HTTP Version Not Supported