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| Header | Interpretation | Example: |
|---|---|---|
| Accept | Specify the type of content the client can receive | Accept: text/plain, text/html |
| Accept-Charset | The character coding set acceptable to the browser. | Accept-Charset: iso-8859-5 |
| Accept-Encoding | Specifies the type of content compression code that the browser can support. | Accept-Encoding: compress, gzip |
| Accept-Language | Languages acceptable to browser | Accept-Language: en,zh |
| Accept-Ranges | You can request one or more sub-range fields of a web entity | Accept-Ranges: bytes |
| Authorization | HTTP Authorized Certificate | Organisation |
| Cache-Control | Designation of a cache mechanism for requests and responses to compliance | Cache-Control: no-cache |
| Connection | indicates whether a permanent connection is required. (HTTP 1.1 default lasting connection) | Connection: close |
| Cookie | When HTTP requests to be sent, all cookies stored under the requested domain are sent together to the web server. | Cookie: $Version=1; Skin=new; |
| Content-Length | Length of content requested | Content-Length: 348 |
| Content-Type | MIME information requested in relation to entities | Content-Type: application/x-www-form-urlencoded |
| Date | Date and time of request | Date: Tue, 15 Nov 2010 08:12:31 GMT |
| Expect | Specific server behaviour requested | Expect: 100-continue |
| From | Email for requesting users | From: user@jsons.cn |
| Host | Specify the domain name and port number of the requested server | Host: www.jsons.cn |
| If-Match | Only if the request matches the entity | If-Match: "Specific value" |
| If-Modified-Since | If the part of the request is modified after the specified time, the request is successful and the code 304 is returned if not modified | If-Modified-Since: Sat, 29 Oct 2010 19:43:31 GMT |
| If-None-Match | If content does not change returns the 304 code, the parameter is the Etag previously sent by the server and the change is judged against the Etag responding server | If-None-Match: "Specific value" |
| If-Range | If the entity does not change, the server sends the lost part of the client, or sends the entire entity. The parameter is also Etag | If-Range: "Specific value" |
| If-Unmodified-Since | Successful request 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 to be transmitted through agents and gateways | Max-Forwards: 10 |
| Pragma | Use to include specific instructions | Pragma: no-cache |
| Proxy-Authorization | Can not open message | Proxy-Authorization: Link to proxy authentication |
| Range | Only part of the entity requested, scope specified | Range: bytes=500-999 |
| Referer | The address of the previous page, the current request page immediately follows, and is on the way | Referer: http://www.jsons.cn |
| TE | Client willing to accept transfer code and notify the server to accept end-up information | TE: trailers,deflate;q=0.5 |
| Upgrade | Specify some transmission protocol to the server for server conversion (if supported) | Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11 |
| User-Agent | User-Agent contains the user message to send the request | User-Agent: Mozilla/5.0 (Linux; X11) |
| Via | Notification of intermediate gateway or proxy address, communication protocol | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | Warning information about the message entity | Warn: 199 Miscellaneous warning |
| Header | Interpretation | Example: |
|---|---|---|
| Accept-Ranges | Indicate if the server supports the scope of the assignment and what type of segment request | Accept-Ranges: bytes |
| Age | Estimated time from original server to proxy cache formation (in seconds, non-negative) | Age: 12 |
| Allow | Effective request for a network resource is not allowed to return 405 | Allow: GET, HEAD |
| Cache-Control | Tell all the cache mechanisms if they can cache and what type. | Cache-Control: no-cache |
| Content-Encoding | The return content compression encoding type supported by the web server. | Content-Encoding: gzip |
| Content-Language | Language of the respondent | Content-Language: en,zh |
| Content-Length | Length of Response | Content-Length: 348 |
| Content-Location | Alternative address for which resources are requested | Content-Location: /index.htm |
| Content-MD5 | Returns resource MD5 validation | Content-MD5: MD5 Validation |
| Content-Range | Returns the byte position of this part of the body | Content-Range: bytes 21010-47021/47022 |
| Content-Type | Returns mimetype of content | Content-Type: text/html; charset=utf-8 |
| Date | Original server message dispatch time | Date: Tue, 15 Nov 2010 08:12:31 GMT |
| ETag | Current value of the entity label of the requested variable | ETag: "Request variable entity label current value" |
| Expires | Date and time of response to expiry | Expires: Thu, 01 Dec 2010 16:00:00 GMT |
| Last-Modified | Final revision of resource requests | Last-Modified: Tue, 15 Nov 2010 12:45:26 GMT |
| Location | Redirect recipients to non-request URLs to complete requests or to mark new resources | Location: http://www.jsons.cn |
| Pragma | Including achieving specific instructions, which can be applied to any recipient in the response chain | Pragma: no-cache |
| Proxy-Authenticate | It points to the parameters of the authentication program and the URL that can be applied to the agent | Proxy-Authenticate: Basic |
| refresh | Used to reorient or create a new resource, redirected after 5 seconds (proposed by web view, supported by most browsers) |
Refresh: 5; url= http://www.jsons.cn
|
| Retry-After | If the entity is temporarily undesirable, notify the client to try again after the specified time | Retry-After: 120 |
| Server | Web Server Software Name | Server: Apache/1.3.27 (Unix) (Red-Hat/Linux) |
| Set-Cookie | Setup Http Cookie | Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1 |
| Trailer | Note the head field exists at the end of the branch transfer code | Trailer: Max-Forwards |
| Transfer-Encoding | File transfer code | Transfer-Encoding:chunked |
| Vary | Tell downstream agents whether to use a cache response or request from the original server | Vary: * |
| Via | Tell the client where the response was sent. | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | Warning entities of possible problems | Warning: 199 Miscellaneous warning |
| WWW-Authenticate | Demonstrate the delegation of authority that the client requesting entity should use | WWW-Authenticate: Basic |
HTTP request header provides information on the requesting, responding or other transmitting entity, and HTTP header information includes generic header, requesting header, response header and the first four parts of the entity
Each domain consists of a domain name, colon (:) and three dimensions of domain value
Common header: available for request and response, as a whole rather than as a specific resource-related issue
Request header: allows clients to transmit information about themselves and the desired form of response
Response header: server and response to transmission of information
Entity header: definition of the information that is transferred to the resource, i.e. that can be used for the request and that can also be used to respond to the request