| Header | Explain. | Example |
|---|---|---|
| Accept | Specified client content type acceptance | Accept:text/plain,text/html |
| Accept-Charset | Browser-supported character encoding set. | Accept-Charset:iso-8859-5 |
| Accept-Encoding | Specify the compression encoding types supported by the browser for web server responses. | Accept-Encoding:compress,gzip |
| Accept-Language | Browser Acceptable Languages | Accept-Language:en,zh |
| Accept-Ranges | You can request one or more child range fields of a web entity. | Accept-Ranges:bytes |
| Authorization | HTTP authorization certificate | Authorization:Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ== |
| Cache-Control | Specify the caching mechanism for the request and response. | Cache-Control:no-cache |
| Connection | Indicate whether a persistent connection is needed. (HTTP 1.1 defaults to persistent connections.) | Connection:close |
| Cookie | When sending an HTTP request, all cookie values stored under the request domain are sent along to the web server. | Cookie:$Version=1;Skin=new; |
| Content-Length | Content length requested | Content-Length:348 |
| Content-Type | Requested MIME information corresponding to the entity | Content-Type:application/x-www-form-urlencoded |
| Date | Date and time of request sent | Date:Tue,15 Nov 2010 08:12:31 GMT |
| Expect | Requested specific server behavior | Expect:100-continue |
| From | Email of the user initiating the request | From:user@email.com |
| Host | Specify the domain name and port number of the requested server. | Host:www.zcmhi.com |
| If-Match | Only requests that match the entity are valid. | If-Match:“737060cd8c284d8af7ad3082f209582d” |
| If-Modified-Since | If the requested part is modified after the specified time, the request is successful; if not, return a 304 code. | If-Modified-Since:Sat,29 Oct 2010 19:43:31 GMT |
| If-None-Match | If content hasn't changed, return 304 status code. Compare the Etag parameter (sent previously by the server) with the Etag in the server's response to determine if it has changed. | If-None-Match:“737060cd8c284d8af7ad3082f209582d” |
| If-Range | If the entity hasn't changed, the server sends the missing part to the client; otherwise, it sends the entire entity. The parameter is also called Etag. | If-Range:“737060cd8c284d8af7ad3082f209582d” |
| If-Unmodified-Since | Success only if the entity has not been modified after the specified time. | If-Unmodified-Since:Sat,29 Oct 2010 19:43:31 GMT |
| Max-Forwards | Limit the time for information transmission via proxies and gateways. | Max-Forwards:10 |
| Pragma | For containing the implementation of specific instructions. | Pragma:no-cache |
| Proxy-Authorization | Access certificate for connecting to the proxy | Proxy-Authorization:Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ== |
| Range | Request only a part of an entity, specify the range. | Range:bytes=500-999 |
| Referer | Previous webpage address, followed by the current requested webpage, i.e., the origin. | Referer:http: |
| TE | Client's acceptable transfer encoding, and notify the server to accept trailing headers. | TE:trailers,deflate;q=0.5 |
| Upgrade | Specify a transmission protocol to the server for conversion (if supported) | Upgrade:HTTP/2.0,SHTTP/1.3,IRC/6.9,RTA/x11 |
| User-Agent | The User-Agent content includes the user information of the request sender. | User-Agent:Mozilla/5.0(Linux;X11) |
| Via | Notify the intermediate gateway or proxy server address, communication protocol. | Via:1.0 fred,1.1 nowhere.com(Apache/1.1) |
| Warning | Warning information about message entities | Warn:199 Miscellaneous warning |
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