What are the HTTP status codes?

HTTP status code categories

As shown below, the HTTP status code is a three-digit integer. The first number is used to identify codes in a specific category:

1XX：信息 - 请求已被接受或流程仍在继续。
2XX：确认操作已成功完成或已被理解。
3XX：重定向 - 需要进行其他操作才能完成请求。
4XX：客户端错误，指示请求无法完成或包含错误的语法。
5XX：服务器错误，指示服务器未能完成认为有效的请求。

Applications that understand HTTP status codes do not need to know all codes, which means that unknown codes also have unknown HTTP reason phrases, which will not Giving users too much information. However, these HTTP applications must understand the categories or classes we described above.

If the software doesn't know what the specific code means, it can at least identify the class. For example, if the application doesn't know about the 490 status code, it can treat it as a 400 because it falls into the same category, and can then assume that something went wrong with the client request.

HTTP status line (HTTP status code HTTP reason phrase)

Official HTTP status line

状态代码  原因短语
100        继续
101        切换协议
102        处理
200        OK
201        创建
202        公认
203        非权威信息
204        无内容
205        重置内容
206        部分内容
207        多态
300        多种选择
301        永久移动
302        发现
303        见其他
304        没有修改
305        使用代理服务器
307        临时重定向
308        永久重定向
400        错误的请求
401        未经授权的
402        需要付款
403        被禁止
404        未找到
405        方法不允许
406        不能接受的
407        需要代理验证
408        请求超时
409        冲突
410        Gone
411        长度要求
412        前提条件失败
413        请求的实体太大
414        请求URI太大
415        不支持的媒体类型
416        请求范围不满意
417        期望失败
421        错误的请求
422        不可处理的实体
423        锁定
424        失败的依赖
425        无序集合
426        需要升级
428        前提要求
429        请求太多
431        请求标头字段太大
451        法律原因不可用
500        内部服务器错误
501        未实现
502        错误的网关
503        暂停服务
504        网关超时
505        不支持HTTP版本
506        变种也谈判
507        存储空间不足
508        检测到环路
510        没有扩展
511        需要网络验证

[1] Only recommended HTTP status codes that come with HTTP reason phrase. Different reason phrases are allowed according to RFC 2616 6.1.1. You may see the HTTP reason phrase replaced with a more "friendly" description or local language.

Unofficial HTTP Status Line

Some third-party services may use the following HTTP status line as an error response, but any RFC will not Specify them.

Other Possible HTTP Status Lines

状态代码 原因短语
103      检查站
420      方法失败
420      增强你的平静
440      登录超时
449      重试
450      被Windows家长控制阻止
451      重定向
498      令牌无效
499      令牌必需
499      防病毒已禁止请求
509      超出带宽限制
530      网站被冻结

It is important to remember that although HTTP status codes may share the same number with error messages in other contexts, such as Device Manager error codes, But that doesn't mean they're related in any way.

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