+ 406: '406 Not Acceptable',
+ 409: '409 Conflict',
+ 410: '410 Gone',
+ 411: '411 Length Required',
+ 412: '412 Precondition Failed',
+ 413: '413 Payload Too Large',
+ 414: '414 URI Too Long',
+ 415: '415 Unsupported Media Type',
+ 416: '416 Range Not Satisfiable',
+ 417: '417 Expectation Failed',
+ 418: "418 I'm a teapot",
+ 429: '429 Too Many Requests',
+ 431: '431 Request Header Fields Too Large',