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| Header | explain | Example |
|---|---|---|
| Accept | Specify the type of content that the client can receive | Accept: text/plain, text/html |
| Accept-Charset | A set of character encodings that the browser can accept. | Accept-Charset: iso-8859-5 |
| Accept-Encoding | Specifies the type of content compression encoding returned by the browser. | Accept-Encoding: compress, gzip |
| Accept-Language | Browser acceptable language | Accept-Language: en,zh |
| Accept-Ranges | One or more sub-range fields of a web entity can be requested | Accept-Ranges: bytes |
| Authorization | HTTP authorization certificate | Authorization: Certificate of Authorization |
| Cache-Control | Specify the caching mechanism to which requests and responses follow | Cache-Control: no-cache |
| Connection | Indicates whether a persistent connection is required. (HTTP 1.1 defaults to persistent connections) | Connection: close |
| Cookie | When an HTTP request is sent, all cookie values stored under the request domain name will be sent to the web server together. | Cookie: $Version=1; Skin=new; |
| Content-Length | Requested content length | Content-Length: 348 |
| Content-Type | The requested MIME information corresponding to the entity | Content-Type: application/x-www-form-urlencoded |
| Date | The date and time of the request to be sent | Date: Tue, 15 Nov 2010 08:12:31 GMT |
| Expect | The specific server behavior requested | Expect: 100-continue |
| From | Email of the requested user | From: [email protected] |
| Host | Specify the domain name and port number of the requested server | Host: AItoolsbar.com |
| If-Match | Only if the requested content matches the entity is valid | If-Match: "Specific value" |
| If-Modified-Since | If the requested part is modified after the specified time, the request is successful, and if it is not modified, a 304 code is returned | If-Modified-Since: Sat, 29 Oct 2010 19:43:31 GMT |
| If-None-Match | If the content has not changed, return the 304 code, and the parameter is the Etag sent by the server before, compare it with the Etag responded by the server to determine whether it has changed. | If-None-Match: "Specific value" |
| If-Range | If the entity has not changed, the server sends the missing part of the client, otherwise the entire entity is sent. The parameter is also Etag | If-Range: "Specific value" |
| If-Unmodified-Since | The request is successful 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 when information is transmitted through the proxy and gateway | Max-Forwards: 10 |
| Pragma | Used to include implementation specific instructions | Pragma: no-cache |
| Proxy-Authorization | Certificate to connect to the proxy | Proxy-Authorization: Authorization certificate linked to the proxy |
| Range | Request only part of the entity, specify the scope | Range: bytes=500-999 |
| Referer | The address of the previous web page, the current requested web page is immediately followed, that is, the way it comes | Referer: http://AItoolsbar.com |
| TE | The transmission code that the client is willing to accept and notify the server to accept the end-top information | TE: trailers,deflate;q=0.5 |
| Upgrade | Specify some transport protocol to the server for conversion (if supported) | Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11 |
| User-Agent | The content of the User-Agent contains the user information that made the request. | 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 the message entity | Warn: 199 Miscellaneous warning |
| Header | explain | Example |
|---|---|---|
| Accept-Ranges | Indicates whether the server supports specified range requests and which type of segment requests | Accept-Ranges: bytes |
| Age | Estimated time (in seconds, non-negative) from the origin server to the proxy cache formation | Age: 12 |
| Allow | If valid request behavior for a certain network resource is not allowed, return 405. | Allow: GET, HEAD |
| Cache-Control | Tell all cache mechanisms whether and which type | Cache-Control: no-cache |
| Content-Encoding | The type of return content compression encoding supported by the web server. | Content-Encoding: gzip |
| Content-Language | Language of the response body | Content-Language: en,zh |
| Content-Length | Length of the response body | Content-Length: 348 |
| Content-Location | Another alternative address to request a resource | Content-Location: /index.htm |
| Content-MD5 | Returns the MD5 check value of the resource | Content-MD5: MD5 check value |
| Content-Range | Byte position of this part in the entire return body | Content-Range: bytes 21010-47021/47022 |
| Content-Type | Returns the MIME type of content | Content-Type: text/html; charset=utf-8 |
| Date | Time of the origin server message | Date: Tue, 15 Nov 2010 08:12:31 GMT |
| ETag | The current value of the entity label of the request variable | ETag: "Request variable entity tag current value" |
| Expires | The date and time of the response expired | Expires: Thu, 01 Dec 2010 16:00:00 GMT |
| Last-Modified | The last modification time of the requested resource | Last-Modified: Tue, 15 Nov 2010 12:45:26 GMT |
| Location | Used to redirect the receiver to the location of the non-requested URL to complete the request or identify a new resource | Location: http://AItoolsbar.com |
| Pragma | Including implementing specific instructions that can be applied to any receiver on the response chain | Pragma: no-cache |
| Proxy-Authenticate | It indicates the authentication scheme and the parameters on that URL that can be applied to the proxy | Proxy-Authenticate: Basic |
| refresh | Apply to redirect or a new resource is created, redirected after 5 seconds (proposed by Netscape, supported by most browsers) |
Refresh: 5; url= AItoolsbar.com/div>
|
| 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 | Set Http Cookies | Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1 |
| Trailer | It indicates that the header field exists at the tail of the block transmission code | Trailer: Max-Forwards |
| Transfer-Encoding | File transfer encoding | Transfer-Encoding:chunked |
| Vary | Tell the downstream agent whether to use cached responses or request from the original server | Vary: * |
| Via | Tell the proxy client where the response is sent | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | Warn of possible problems for entities | Warning: 199 Miscellaneous warning |
| WWW-Authenticate | Indicates that the authorization scheme that the client requesting entity should use | WWW-Authenticate: Basic |
HTTP request header provides information about request, response or other sending entities. HTTP header information includes four parts: general header, request header, response header and entity header.
Each header domain consists of three parts: a domain name, a colon (:) and a domain value.
Generic header: can be used for requests or responses, associated with transactions as a whole rather than a specific resource
Request header: Allows the client to pass information about itself and the desired response form
Response header: The server and the response to passing its own information
Entity header: Defines the information of the transferred resource, which can be used for requests or responses
Link:aitoolsbar