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1、对http协议的理解The1.httpprotocolisstateless・HTTPisastatelessconnectionprotoco1.2.statelessprotocol-theprotocolhasnomemoryfortransactionprocessing・Alackofstatusmeansthatifsubsequentprocessingrequiresthepreviousinformation,itmustberetransmitted,whichcouldresultinanincreaseintheamountofdatatransferred
2、perconnection.Ontheotherhand,whentheserverdoesnotneedthepreviousinformation,ithasaquickerresponse.Thedynamicinteractionbetweenthedientandtheserverweb3.applications,characteristicsofHTTPnostatehasseriouslyhinderedtherealizationoftheseapplications,afterallinteractionisneededinthepastandasimplesh
3、oppingcartprogramalsoneedtoknowwhatusersbeforechoosingwhatgoods・Asaresult,twotechniquesformaintainingthestateoftheHTTPconnectioncameintobeing,oneforcookieandtheotherforsession.HTTPisastatelessprotocol,inordertosupportinteractionbetweentheclientandtheserver,weneedthroughdifferenttechnologyforin
4、teractivestoragestate,andthesedifferenttechnologiesarecookieandsession.4.cookieisthesolutiontomaintainthestatethroughthedient.Bydefinition,cookieisspecialinformationbytheservertotheclient,andthisinformationisstoredintextfilesonthedient,thentheclienteachtimetosendtherequesttotheserverwilltaketh
5、esespecialinformation.Forexample,whenusersusethebrowsertoaccessacookiesupportwebsite,userswillprovidepersonalinformation,includingusernameandsubmittotheserver;then,atthesametime,theservertotheclienttoreturnthecorrespondinghypertextwillsendthepersonalinformation,ofcourse,suchinformationisnotsto
6、redinthebodyoftheresponseresponseinbodyHTTPbut,theHTTPheaderresponseheader;afterreceivingaresponsefromtheservertotheclientbrowser,thebrowserwillstoretheinformationinaunifiedpositionforthewindowsoperatingsystem,wecanlearnfrom:[]:findsystemdiskstorageCookieDocumentsandSettings[name]Cookiesdir
7、ectory;sincethen.Whentheclientsendstherequesttotheserveragain,itsendsthecorrespondingcookiebacktotheserver・Thistime,thecookieinformationisstoredintheHTTPrequestheaderrequestheader・HTTPstatelessorwebstateless?Whatdowemeanbythestatelessna
