HTTP状态码

很多人在打开网页都遇到过404错误，网络开发中判断返回码是否等于200判定网络请求是否成功... ...这些是最常见的状态码。

参考RFC7231和状态码注册表，了解一下全部HTTP状态码。

状态码被分为五大类：

1xx：信息性-收到请求，继续进行

2xx：成功-该动作已成功接收，理解并接受

3xx：重定向-必须采取进一步的措施才能完成请求

4xx：客户端错误-请求包含错误的语法或无法实现

5xx：服务器错误-服务器无法满足看似有效的请求

互联网数字分配机构（IANA）维护了一张最全的官方认证HTTP Code。一些字段暂未被使用，最新的状态码移步查阅：Hypertext Transfer Protocol (HTTP) Status Code Registry。

[100-199] 用于指定客户端应相应的某些动作。

[200-299] 用于表示请求成功。

200	OK	[RFC7231, Section 6.3.1]
201	Created	[RFC7231, Section 6.3.2]
202	Accepted	[RFC7231, Section 6.3.3]
203	Non-Authoritative Information	[RFC7231, Section 6.3.4]
204	No Content	[RFC7231, Section 6.3.5]
205	Reset Content	[RFC7231, Section 6.3.6]
206	Partial Content	[RFC7233, Section 4.1]
207	Multi-Status	[RFC4918]
208	Already Reported	[RFC5842]
209-225	Unassigned
226	IM Used	[RFC3229]
227-299	Unassigned

[300-399] 用于已经移动的文件并且常被包含在定位头信息中指定新的地址信息。

[400-499] 用于指出客户端的错误。

400	Bad Request	[RFC7231, Section 6.5.1]
401	Unauthorized	[RFC7235, Section 3.1]
402	Payment Required	[RFC7231, Section 6.5.2]
403	Forbidden	[RFC7231, Section 6.5.3]
404	Not Found	[RFC7231, Section 6.5.4]
405	Method Not Allowed	[RFC7231, Section 6.5.5]
406	Not Acceptable	[RFC7231, Section 6.5.6]
407	Proxy Authentication Required	[RFC7235, Section 3.2]
408	Request Timeout	[RFC7231, Section 6.5.7]
409	Conflict	[RFC7231, Section 6.5.8]
410	Gone	[RFC7231, Section 6.5.9]
411	Length Required	[RFC7231, Section 6.5.10]
412	Precondition Failed	[RFC7232, Section 4.2][RFC8144, Section 3.2]
413	Payload Too Large	[RFC7231, Section 6.5.11]
414	URI Too Long	[RFC7231, Section 6.5.12]
415	Unsupported Media Type	[RFC7231, Section 6.5.13][RFC7694, Section 3]
416	Range Not Satisfiable	[RFC7233, Section 4.4]
417	Expectation Failed	[RFC7231, Section 6.5.14]
418-420	Unassigned
421	Misdirected Request	[RFC7540, Section 9.1.2]
422	Unprocessable Entity	[RFC4918]
423	Locked	[RFC4918]
424	Failed Dependency	[RFC4918]
425	Too Early	[RFC8470]
426	Upgrade Required	[RFC7231, Section 6.5.15]
427	Unassigned
428	Precondition Required	[RFC6585]
429	Too Many Requests	[RFC6585]
430	Unassigned
431	Request Header Fields Too Large	[RFC6585]
432-450	Unassigned
451	Unavailable For Legal Reasons	[RFC7725]
452-499	Unassigned

[500-599] 用于支持服务器错误。

500	Internal Server Error	[RFC7231, Section 6.6.1]
501	Not Implemented	[RFC7231, Section 6.6.2]
502	Bad Gateway	[RFC7231, Section 6.6.3]
503	Service Unavailable	[RFC7231, Section 6.6.4]
504	Gateway Timeout	[RFC7231, Section 6.6.5]
505	HTTP Version Not Supported	[RFC7231, Section 6.6.6]
506	Variant Also Negotiates	[RFC2295]
507	Insufficient Storage	[RFC4918]
508	Loop Detected	[RFC5842]
509	Unassigned
510	Not Extended	[RFC2774]
511	Network Authentication Required	[RFC6585]
512-599	Unassigned