100 => 'Continue', //继续
101 => 'Switching Protocols', //交换协议
102 => 'Processing', //处理 // RFC2518
103 => 'Early Hints', //提前暗示
200 => 'OK',
201 => 'Created',
202 => 'Accepted', //认可的
203 => 'Non-Authoritative Information', //非授权信息
204 => 'No Content', //无内容
205 => 'Reset Content', //重置内容
206 => 'Partial Content', //部分内容
207 => 'Multi-Status', //多状态 // RFC4918
208 => 'Already Reported', //已经播报 // RFC5842
226 => 'IM Used', //异步使用 // RFC3229
300 => 'Multiple Choices', //多选
301 => 'Moved Permanently', //永久移除
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect', //临时跳转
308 => 'Permanent Redirect', //永久跳转 // RFC7238
400 => 'Bad Request', //无效请求
401 => 'Unauthorized', //未授权请求
402 => 'Payment Required', //请求不允许
403 => 'Forbidden', //请求被禁止
404 => 'Not Found', //请求对象不存在
405 => 'Method Not Allowed', //方法不允许
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required', //需要代理身份验证
408 => 'Request Timeout', //请求超时
409 => 'Conflict', //冲突
410 => 'Gone', //请求丢失
411 => 'Length Required',
412 => 'Precondition Failed', //先决条件失败
413 => 'Payload Too Large', //负载太大
414 => 'URI Too Long', //url太长
415 => 'Unsupported Media Type', //媒体类型不支持
416 => 'Range Not Satisfiable', //范围不适合
417 => 'Expectation Failed', //预期失败
418 => 'I\'m a teapot', // RFC2324
421 => 'Misdirected Request', //误导请求 // RFC7540
422 => 'Unprocessable Entity', //无法处理的实体 // RFC4918
423 => 'Locked', // RFC4918
424 => 'Failed Dependency', // RFC4918
425 => 'Reserved for WebDAV advanced collections expired proposal', //保留用于WebDAV高级集合过期提案 // RFC2817
426 => 'Upgrade Required', // RFC2817
428 => 'Precondition Required', //要求先决条件 // RFC6585
429 => 'Too Many Requests', // RFC6585
431 => 'Request Header Fields Too Large', //请求头字段太大 // RFC6585
451 => 'Unavailable For Legal Reasons', //因法律原因无法获得 // RFC7725
499 => 'Client has closed connection' //客户端主动关闭连接
500 => 'Internal Server Error', //内部服务器错误
501 => 'Not Implemented', //未实现
502 => 'Bad Gateway', //无效网关
503 => 'Service Unavailable', //服务不可用
504 => 'Gateway Timeout', //网关连接超时
505 => 'HTTP Version Not Supported', //http 版本不支持
506 => 'Variant Also Negotiates', //服务器存在内部配置错误 // RFC2295
507 => 'Insufficient Storage', //远程服务器返回错误 // RFC4918
508 => 'Loop Detected', // RFC5842
510 => 'Not Extended', // RFC2774
511 => 'Network Authentication Required', //客户端需要进行身份验证以获得网络访问。
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