- 1xx: Informational - Request received, continuing process
- 100 - Continue
- 101 - Switching Protocols
- 2xx: Success - The action was successfully received, understood, and accepted
- 200 - OK
- 201 - Created
- 202 - Accepted
- 203 - Non-Authoritative Information
- 204 - No Content
- 205 - Reset Content
- 206 - Partial Content
- 3xx: Redirection - Further action must be taken in order to complete the request
- 300 - Multiple Choices
- 301 - Moved Permanently
- 302 - Found
- 303 - See Other
- 304 - Not Modified
- 305 - Use Proxy
- 307 - Temporary Redirect
- 4xx: Client Error - The request contains bad syntax or cannot be fulfilled
- 400 - Bad Request
- 401 - Unauthorized
- 402 - Payment Required
- 403 - Forbidden
- 404 - Not Found
- 405 - Method Not Allowed
- 406 - Not Acceptable
- 407 - Proxy Authentication Required
- 408 - Request Time-out
- 409 - Conflict
- 410 - Gone
- 411 - Length Required
- 412 - Precondition Failed
- 413 - Request Entity Too Large
- 414 - Request-URI Too Large
- 415 - Unsupported Media Type
- 416 - Requested range not satisfiable
- 417 - Expectation Failed
- 5xx: Server Error - The server failed to fulfill an apparently valid request
- 500 - Internal Server Error
- 501 - Not Implemented
- 502 - Bad Gateway
- 503 - Service Unavailable
- 504 - Gateway Time-out
- 505 - HTTP Version not supported