Tip: Ctrl + F to find quickly
| Header | explain | example |
|---|---|---|
| Accept | Specifies the type of content the client side can receive | Accepted: text/plain, text/html |
| Accept-Charset | The set of character encodings accepted by the browser. | Accept-Charset: iso-8859-5 |
| Accept-Encoding | Specifies the type of content compression encoding that web servers can support. | Accept-Encoding: compressed, gzip |
| Accept-Language | Languages accepted by browsers | Accept-Language: en, zh |
| Accept-Ranges | You can request one or more subscope fields of a web page entity | Accept-Ranges: bytes |
| Authorization | Authorization certificate for HTTP authorization | Authorization: Authorization certificate |
| Cache-Control | Specify the caching mechanism that requests and responses follow | Cache-Control: no-cache |
| Connection | Indicates whether a persistent connection is required. (HTTP 1.1 defaults to persistent connections) | Connection: closed |
| Cookie | When an HTTP request is sent, all the cookie values stored in the request domain are sent to the web server together. | Cookies: $Version = 1; Skin = new; |
| Content-Length | The length of the requested content | 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 the request was sent | Date: Tue, 15 Nov 2010 08:12:31 GMT |
| Expect | The specific server behavior requested | Expected: 100-continue |
| From | Email of the requesting user | From: [email protected] |
| Host | Specify the domain name and port number of the requesting server | Host: www.webmastertoolbag.com |
| If-Match | Valid only if the request content 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 if it is not modified, a 304 code is returned. | If-Modified-Since: Sat, 29 Oct 2010 19:43:31 GMT |
| If-One-Match | If the content has not changed, return 304 code, the parameter is the Etag previously sent by the server, and compare it with the Etag responded by the server to determine whether it has changed. | If-One-Match: "Specific Value" |
| if-Range | If the entity has not changed, the server sends the missing part of the client side, 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 for information to pass through proxies and gateways | Max-Forwards: 10 |
| Pragma | Used to contain implementation-specific instructions | Pragma: no-cache |
| Proxy-Authorization | Authorization certificate to connect to the broker | Proxy-Authorization: The authorization certificate linked to the proxy |
| Range | Request only part of the entity, specifying the scope | Range: bytes = 500-999 |
| Referer | The address of the previous page, followed by the current requested page, i.e. the path | Referer: http://www.webmastertoolbag.com |
| TE | The client side is willing to accept the transmission code, and notifies the server to accept the trailing header information | TE: trailers, deflate; q = 0.5 |
| Upgrade | Specify a transport protocol to the server for the server to convert (if supported). | Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11 |
| User-Agent | The content of the User-Agent contains information about the user who made the request | User-Agent: Mozilla/5.0 (Linux; X11) |
| Via | Notify the intermediary gateway or proxy server address, communication protocol | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | Warning messages about message entities | Warning: 199 Miscellaneous warnings |
| Header | explain | example |
|---|---|---|
| Accept-Ranges | Indicates whether the server supports specified range requests and what type of segmentation requests | Accept-Ranges: bytes |
| Age | Estimated time from origin server to proxy cache formation (in seconds, non-negative) | Age: 12 |
| Allow | A valid request for a network resource, 405 if not allowed. | Allowed: GET, HEAD |
| Cache-Control | Tell all caching mechanisms whether they can be cached and what type | Cache-Control: no-cache |
| Content-Encoding | Return content compression encoding types supported by the web server. | Content-Encoding: gzip |
| Content-Language | Responsive language | Content-Language: en, zh |
| Content-Length | The length of the response body | Content-Length: 348 |
| Content-Location | Request another alternative address for the resource | Content-Location: /index.htm |
| Content-MD5 | Returns the MD5 checksum of the resource | Content-MD5: MD5 checksum |
| Content-Range | The byte position of this section in the entire return body | Content-Range: bytes 21010-47021/47022 |
| Content-Type | The MIME type of the returned content | Content-Type: text/html; charset = utf-8 |
| Date | The time when the original server message was sent | 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 the response expires | 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 recipient to a non-request URL location to complete the request or identify a new resource | Location: http://www.webmastertoolbag.com |
| Pragma | Includes implementation-specific instructions that can be applied to any recipient in the response chain | Pragma: no-cache |
| Proxy-Authenticate | It indicates the authentication scheme and the parameters that can be applied to this URL of the proxy | Proxy-Authenticate: Basic |
| Refresh | Applied to a redirect or a new resource is created, redirected after 5 seconds (proposed by Netscape and supported by most browsers) |
Refresh: 5; url = http://www.webmastertoolbag.com
|
| Retry-After | If the entity is temporarily undesirable, notify the client side 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 | Setting HTTP Cookies | Set-Cookie: UserID = JohnDoe; Max-Age = 3600; Version = 1 |
| Trailer | Indicates that the header field exists at the tail of the chunked transfer code | Trailer: Max-Forwards |
| Transfer-Encoding | file transfer encoding | Transfer-Encoding: chunked |
| Vary | Tell downstream proxies whether to use cached responses or request from the origin server | Vary: * |
| Via | Tell the client side where the response was sent | Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1) |
| Warning | Warning entities of possible problems | Warnings: 199 Miscellaneous warnings |
| WWW-Authenticate | Indicates the authorization scheme that the client side requesting entity should use | WWW-Authenticate: Basic |
The HTTP request header provides information about the request, response, or other sending entity. The HTTP header information includes four parts: general header, request header, response header, and entity header
Each header field consists of a domain name, a colon (:), and a domain value
Generic headers: can be used for both requests and responses, and are associated with a transaction as a whole rather than as a specific resource
Request header: Allows the client side to pass information about itself and the desired response form
Response headers: the server and the response used to communicate its own information
Entity headers: information that defines the resource being transmitted, which can be used for both requests and responses
