HTTP (HyperTextTransferProtocol) Hypertext Transfer Protocol, a common protocol for the transmission of the current page. HTTP protocol uses a request / response model, a browser or other client makes a request, the server gives a response. Air Jordans Men's On the whole network resource transmission, including message-header and message-body in two parts. First pass message- header, ie http header message. http header message is usually divided into four sections: general header, request header, response header, entity header. However, this method can be understood in terms of points, I feel not very clear boundaries. According to Wikipedia the organizational form of the http header content, Request and Response divided into two parts. Header explain exemplary Accept Requests section to specify 2013 Air Jordan 4 (IV) Retro the client can receive content type Accept: text / plain, text / htmlAccept-Charset browser can accept the character encoding. Accept-Charset: iso-8859-5Accept-Encoding specifies the browser to support web server returns the content compression encoding type. Accept-Encoding: compress, gzipAccept-Language browser language acceptable Accept-Language: en, zhAccept-Ranges may request one or more pages entities sub-range field Accept-Ranges: bytesAuthorizationHTTP an authorization certificate Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ == Cache-Control requests and responses follow the specified caching mechanism Cache-Control: no-cacheConnection indicating whether a persistent connection. (HTTP 1.1 persistent connection by default) Connection: all cookie values closeCookieHTTP request, the request will be stored at the domain name to send to your web server. Cookie: $ Version = 1; Skin = new; Content-Length Content-Length Content-Length request: Date of application / x-www-form-urlencodedDate request: The entity information corresponding to the MIME Content-Type 348Content-Type request and Time Date: Tue, specific server behavior 15 Nov 2010 08:12:31 GMTExpect request Expect: 100-continueFrom Air Max for Women requesting user's EmailFrom: user@email.comHost specify the domain name and port number of the server Host request: www .zcmhi.comIf-Match only entity that matches the requested content is valid If-Match: '737060cd8c284d8af7ad3082f209582d' section If-Modified-Since request to be modified if the request succeeds after a specified time, it returns a 304 code has not been modified If- Modified-Since: Sat, 29 Oct 2010 19:43:31 GMTIf-None-Match if the content has not changed return 304 code parameters previously sent Etag server, and the server response Etag comparison determination whether to change the If-None-Match: '737060cd8c284d8af7ad3082f209582d' If-Range If the entity is not changed, the server sends the client missing parts, or else send the entire entity. Parameters for EtagIf-Range: '737060cd8c284d8af7ad3082f209582d' If-Unmodified-Since only the entity has not been modified after a specified time before the request is successful If-Unmodified-Since: Sat, 29 Oct 2010 19:43:31 GMTMax-Forwards limit information Acting time and Gateway transmission of Max-Forwards: 10Pragma used Nike 2012 Cheap Nike Air Jordan 1 High Heels For Sale Beige Pink shoes online to contain implementation-specific instruction Pragma: no-cacheProxy-Authorization to connect to an authorized Certificate Authority's Proxy-Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ 180-159220 Nike LeBron 7 VII Soldier White Black Running Shoes == Range only a part of the entity's request, the specified range Range: bytes = 500-999Referer address previous pages, current page, followed by a request that the origin Referer: http://www.zcmhi.com/archives/71.htmlTE client is willing to accept the transfer encoding, and notifies the server to accept accept the tail plus Air Jordan 12 header TE: trailers, deflate; q = 0.5Upgrade specify Air Jordan 13 certain transmission protocol to the server so that the server for conversion (if supported) Upgrade: HTTP / 2.0, SHTTP / 1.3, IRC / 6.9, RTA / x11User-AgentUser- Content Agent contains requesting user information User-Agent: Mozilla / 5.0 (Linux; X11) Via inform intermediate gateway or proxy server address, communication protocols Via: 1.0 fred, 1.1 nowhere.com (Apache / 1.1) Warning about the message entity The warning message Warn: 199 Miscellaneous warningResponses part Header explain exemplary Accept-Ranges indicate whether the server supports the specified range requests and what type of segmentation request Accept-Ranges: estimated time bytesAge from the original server to the proxy Nike Shoes cache formation (in seconds, non-negative) Age: 12Allow valid request for a network resource behavior, do not allow returns 405Allow: GET, HEADCache-Control tell whether all the caching mechanism can be cached and what type of Cache-Control: no-cacheContent-Encodingweb server support return content compression encoding type. Content-Encoding: gzipContent-Language Response body language Content-Language: en, zhContent-Length response length body Content-Length: 348Content-Location resource request alternate alternative another address Content-Location: /index.htmContent- MD5 MD5 checksum return resources Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ == Content-Range throughout the body in return byte position in this part of Content-Range: bytes 21010-47021 / 47022Content-Type returns the contents of MIME types Content-Type: text Air Jordan 1 / html; charset = utf-8Date time the original server messages issued Date: Tue, 15 Nov 2010 08:12:31 GMTETag the current value of the entity tag of the request variables ETag: '737060cd8c284d8af7ad3082f209582d' Expires response Air Jordan 10 expiration date and time Expires: Thu, 01 Dec 2010 16:00:00 GMTLast-Modified request was last modified resources Last-Modified: Tue, 15 Nov 2010 12:45:26 GMTLocation to redirect the recipient to unsolicited position to fulfill the request or URL identify new resources Location: http://www.zcmhi.com/archives/94.htmlPragma including the achievement of specific instructions, which can be applied to Nike Shoes Global any recipient response chain Pragma: no-cacheProxy-Authenticate Lebron James Shoes It noted that certification scheme and It can be applied to the parameters of the Proxy-Authenticate proxy URL on: Basicrefresh applied to redirect or a new resource is created, redirected (presented by the Netscape, supported by most browsers) After five seconds Refresh: 5; url = http: //www.zcmhi.com/archives/94.htmlRetry-After If the entity is temporarily not desirable, notify the client tries to Retry-After again after a specified time: 120Serverweb server software Name Server: Apache / 1.3.27 ( Unix) (Red-Hat / Linux) Set-Cookie Set Http CookieSet-Cookie: UserID = JohnDoe; Max-Age = 3600; Version = 1Trailer pointed header field presence in chunked transfer encoding Tail Trailer: Max-ForwardsTransfer-Encoding file Transfer-Encoding Transfer-Encoding: chunkedVary tell downstream proxy is using the cache or in response to a request from the original server Vary: Air Max for Men * Via inform proxy client where response is sent by Air Jordan 11 Via: 1.0 fred, 1.1 nowhere.com (Apache / 1.1) Warning Warning entity possible problems Warning: 199 Miscellaneous warningWWW-Authenticate indicates that the client requests authorization scheme WWW-Authenticate entity that should be used: Basic More See w3c official website Header Field DefinitionsHTTP Header Comments