HTTP参考手册

状态 | Status

HTTP 503 Service Unavailable服务器错误响应代码指示服务器尚未准备好处理请求。

常见原因是服务器因维护或重载而停机。请注意，与此响应一起，应发送解释问题的用户友好页面。这个响应应该用于临时条件Retry-After，如果可能，HTTP 头应该包含服务恢复的估计时间。

与此响应一起发送的与缓存相关的头文件应予以处理，因为503状态通常是临时条件，通常不应缓存响应。

503 Service Unavailable

规范	标题
RFC 7231，第6.6.4节：503服务不可用	超文本传输协议（HTTP / 1.1）：语义和内容

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic Support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic Support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

1.100 Continue
2.101 Switching Protocols
3.200 OK
4.201 Created
5.202 Accepted
6.203 Non-Authoritative Information
7.204 No Content
8.205 Reset Content
9.206 Partial Content
10.300 Multiple Choices
11.301 Moved Permanently
12.302 Found
13.303 See Other
14.304 Not Modified
15.307 Temporary Redirect
16.308 Permanent Redirect
17.400 Bad Request
18.401 Unauthorized
19.403 Forbidden
20.404 Not Found
21.405 Method Not Allowed
22.406 Not Acceptable
23.407 Proxy Authentication Required
24.408 Request Timeout
25.409 Conflict
26.410 Gone
27.411 Length Required
28.412 Precondition Failed
29.413 Payload Too Large
30.414 URI Too Long
31.415 Unsupported Media Type
32.416 Range Not Satisfiable
33.417 Expectation Failed
34.426 Upgrade Required
35.428 Precondition Required
36.429 Too Many Requests
37.431 Request Header Fields Too Large
38.451 Unavailable For Legal Reasons
39.500 Internal Server Error
40.501 Not Implemented
41.502 Bad Gateway
42.504 Gateway Timeout
43.505 HTTP Version Not Supported
44.511 Network Authentication Required
45.Status

HTTP

超文本传输协议（ HTTP，HyperText Transfer Protocol ) 是互联网上应用最为广泛的一种网络协议。所有的 WWW 文件都必须遵守这个标准。

1.指南 \| Guides
2.指南：基础 \| Guides: Basics
3.CSP
4.标题 \| Headers
5.方法 \| Methods
6.RFC 2616: HTTP/1.1
7.RFC 4918: WebDAV
8.RFC 5023: The Atom Publishing Protocol
9.RFC 7230: Message Syntax and Routing
10.RFC 7231: Semantics and Content
11.RFC 7232: Conditional Requests
12.RFC 7233: Range Requests
13.RFC 7234: Caching
14.RFC 7235: Authentication
15.状态 \| Status
16.HTTP 请求方法
17.HTTP状态码
18.HTTP 响应头信息
19.HTTP 教程