HTTP参考手册

标题 | Headers

Warning一般 HTTP 标头包含有关该消息的状态可能出现的问题的信息。Warning响应中可能会出现多个标题。

Warning 标题字段通常可以应用于任何消息，但某些警告代码是特定于高速缓存的，只能应用于响应消息。

Header type	General header
Forbidden header name	no

Warning: <warn-code> <warn-agent> <warn-text> [<warn-date>]

<警告码>一个三位警告号码。第一位数字表示是否Warning需要在验证后从存储的响应中删除。

<warn-agent>

添加Warning标题的服务器或软件的名称或假名（代理未知时可能为“ - ”）。

<warn-text> 描述错误的建议文本 <warn-date> 可选。如果Warning发送多个标题，请包含与Date标题匹配的日期。

iana.org 上的 HTTP 警告代码注册表定义了警告代码的命名空间。

Code	Text	Description
110	Response is Stale	A response provided by a cache is stale (the expiration time set for it has passed).
111	Revalidation Failed	An attempt to validate the response failed, due to an inability to reach the server.
112	Disconnected Operation	The cache is disconnected from the rest of the network.
113	Heuristic Expiration	Sent If a cache heuristically chose a freshness lifetime greater than 24 hours and the response's age is greater than 24 hours.
199	Miscellaneous Warning	Arbitrary, non-specific warning
214	Transformation Applied	Added by a proxy if it applies any transformation to the representation, such as changing the content-coding, media-type or the like.
299	Miscellaneous Warning	Same as 199, but indicating a persistent warning

Warning: 110 anderson/1.3.37 "Response is stale"

Date: Wed, 21 Oct 2015 07:28:00 GMT 
Warning: 112 - "cache down" "Wed, 21 Oct 2015 07:28:00 GMT"

Specification	Title
RFC 7234, section 5.5: Warning	Hypertext Transfer Protocol (HTTP/1.1): Caching

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.Accept
2.Accept-Charset
3.Accept-Encoding
4.Accept-Language
5.Accept-Ranges
6.Access-Control-Allow-Credentials
7.Access-Control-Allow-Headers
8.Access-Control-Allow-Methods
9.Access-Control-Allow-Origin
10.Access-Control-Expose-Headers
11.Access-Control-Max-Age
12.Access-Control-Request-Headers
13.Access-Control-Request-Method
14.Age
15.Allow
16.Authorization
17.Cache-Control
18.Connection
19.Content-Disposition
20.Content-Encoding
21.Content-Language
22.Content-Length
23.Content-Location
24.Content-Range
25.Content-Type
26.Cookie
27.Cookie2
28.Date
29.DNT
30.ETag
31.Expect
32.Expires
33.Forwarded
34.From
35.Headers
36.Host
37.If-Match
38.If-Modified-Since
39.If-None-Match
40.If-Range
41.If-Unmodified-Since
42.Keep-Alive
43.Large-Allocation
44.Last-Modified
45.Location
46.Origin
47.Pragma
48.Proxy-Authenticate
49.Proxy-Authorization
50.Public-Key-Pins
51.Public-Key-Pins-Report-Only
52.Range
53.Referer
54.Referrer-Policy
55.Retry-After
56.Server
57.Set-Cookie
58.Set-Cookie2
59.SourceMap
60.Strict-Transport-Security
61.TE
62.Tk
63.Trailer
64.Transfer-Encoding
65.Upgrade-Insecure-Requests
66.User-Agent
67.User-Agent: Firefox
68.Vary
69.Via
70.WWW-Authenticate
71.X-Content-Type-Options
72.X-DNS-Prefetch-Control
73.X-Forwarded-For
74.X-Forwarded-Host
75.X-Forwarded-Proto
76.X-Frame-Options
77.X-XSS-Protection

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