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本科毕业设计外文文献翻译二O一O年六月学生姓名XXX学院信息工程学院系别计算机系专业软件工程班级软件06指导教师XXX讲师A1A0A2A3A5A7A7A7A1A8A5A7A7A7A4A4A4A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A211THEHTTPREQUEST/RESPONSEMODELJAVASERVERPAGES,THIRDEDITIONAUTHORA22HANSBERGSTEN1REQUESTSINDETAILLETSTAKEACLOSERLOOKATREQUESTSAUSERSENDSAREQUESTTOTHESERVERBYCLICKINGALINKONAWEBPAGE,SUBMITTINGAFORM,ORTYPINGINAWEBPAGEADDRESSINTHEBROWSERSADDRESSFIELDTOSENDAREQUEST,THEBROWSERNEEDSTOKNOWWHICHSERVERTOTALKTOANDWHICHRESOURCETOASKFORTHISINFORMATIONISSPECIFIEDBYANHTTPUNIFORMRESOURCELOCATORURLHTTP/WWWGEFIONSOFTWARECOM/INDEXHTMLTHEFIRSTPARTOFTHEURLSHOWNSPECIFIESTHATTHEREQUESTISMADEUSINGTHEHTTPPROTOCOLTHISISFOLLOWEDBYTHENAMEOFTHESERVER,INTHISCASEWWWGEFIONSOFTWARECOMTHEWEBSERVERWAITSFORREQUESTSTOCOMEINONASPECIFICTCP/IPPORTPORTNUMBER80ISTHESTANDARDPORTFORHTTPREQUESTSIFTHEWEBSERVERUSESANOTHERPORT,THEURLMUSTSPECIFYTHEPORTNUMBERINADDITIONTOTHESERVERNAMEFOREXAMPLEHTTP/WWWGEFIONSOFTWARECOM8080/INDEXHTMLTHISREQUESTISSENTTOASERVERTHATUSESPORT8080INSTEADOF80THELASTPARTOFTHEURL,/INDEXHTML,IDENTIFIESTHERESOURCETHATTHECLIENTISREQUESTINGAURLISACTUALLYASPECIALIZATIONOFAUNIFORMRESOURCEIDENTIFIERURI,DEFINEDINTHERFC2396SPECIFICATIONAURLIDENTIFIESARESOURCEPARTLYBYITSLOCATION,FORINSTANCETHESERVERTHATCONTAINSTHERESOURCEANOTHERTYPEOFURIISAUNIFORMRESOURCENAMEURN,WHICHISAGLOBALLYUNIQUEIDENTIFIERTHATISVALIDNOMATTERWHERETHERESOURCEISLOCATEDHTTPDEALSONLYWITHTHEURLVARIETYTHETERMSURIANDURLAREOFTENUSEDINTERCHANGEABLE,ANDUNFORTUNATELY,THEYHAVESLIGHTLYDIFFERENTDEFINITIONSINDIFFERENTSPECIFICATIONSIMTRYINGTOUSETHETERMSASDEFINEDBYTHEHTTP/11SPECIFICATIONRFC2616,WHICHISPRETTYCLOSETOHOWTHEYAREALSOUSEDINTHESERVLETANDJSPSPECIFICATIONSHENCE,IUSETHETERMURLONLYWHENTHEURIMUSTSTARTWITHHTTPORHTTPS,FORHTTPOVERANENCRYPTEDCONNECTIONFOLLOWEDBYASERVERNAMEANDPOSSIBLYAPORTNUMBER,ASINTHEPREVIOUSEXAMPLESIUSEURIASAGENERICTERMFORANYSTRINGTHATIDENTIFIESARESOURCE,WHERETHELOCATIONCANBEDEDUCEDFROMTHECONTEXTANDISNTNECESSARILYPARTOFTHEA23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A212URIFOREXAMPLE,WHENTHEREQUESTHASBEENDELIVEREDTOTHESERVER,THELOCATIONISAGIVEN,ANDONLYTHERESOURCEIDENTIFIERISIMPORTANTTHEBROWSERUSESTHEURLINFORMATIONTOCREATETHEREQUESTMESSAGEITSENDSTOTHESPECIFIEDSERVERUSINGTHESPECIFIEDPROTOCOLANHTTPREQUESTMESSAGECONSISTSOFTHREETHINGSAREQUESTLINE,REQUESTHEADERS,ANDPOSSIBLYAREQUESTBODYTHEREQUESTLINESTARTSWITHTHEREQUESTMETHODNAME,FOLLOWEDBYARESOURCEIDENTIFIERANDTHEPROTOCOLVERSIONUSEDBYTHEBROWSERGET/INDEXHTMLHTTP/11THEMOSTCOMMONLYUSEDREQUESTMETHODISNAMEDGETASTHENAMEIMPLIES,AGETREQUESTISUSEDTORETRIEVEARESOURCEFROMTHESERVERITSTHEDEFAULTREQUESTMETHOD,SOIFYOUTYPEAURLINTHEBROWSERSADDRESSFIELD,ORCLICKONALINK,THEREQUESTISSENTASAGETREQUESTTOTHESERVERTHEREQUESTHEADERSPROVIDEADDITIONALINFORMATIONTHESERVERMAYUSETOPROCESSTHEREQUESTTHEMESSAGEBODYISINCLUDEDONLYINSOMETYPESOFREQUESTS,LIKETHEPOSTREQUESTDISCUSSEDLATERHERESANEXAMPLEOFAVALIDHTTPREQUESTMESSAGEGET/INDEXHTMLHTTP/11HOSTWWWGEFIONSOFTWARECOMUSERAGENTMOZILLA/50WINDOWSUWIN9X490ENUSRV102ACCEPTIMAGE/GIF,IMAGE/JPEG,IMAGE/PJPEG,IMAGE/PNG,/ACCEPTLANGUAGEENACCEPTCHARSETISO88591,UTF8THEREQUESTLINESPECIFIESTHEGETMETHODANDASKSFORTHERESOURCENAMED/INDEXHTMLTOBERETURNEDUSINGTHEHTTP/11PROTOCOLVERSIONTHEVARIOUSHEADERSPROVIDEADDITIONALINFORMATIONTHEHOSTHEADERTELLSTHESERVERTHEHOSTNAMEUSEDINTHEURLASERVERMAYHAVEMULTIPLENAMES,SOTHISINFORMATIONISUSEDTODISTINGUISHBETWEENMULTIPLEVIRTUALWEBSERVERSSHARINGTHESAMEWEBSERVERPROCESSTHEUSERAGENTHEADERCONTAINSINFORMATIONABOUTTHETYPEOFBROWSERMAKINGTHEREQUESTTHESERVERCANUSETHISTOSENDDIFFERENTTYPESOFRESPONSESTODIFFERENTTYPESOFBROWSERSFORINSTANCE,IFTHESERVERKNOWSWHETHERINTERNETEXPLORERORNETSCAPENAVIGATORA23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A213ISUSED,ITCANSENDARESPONSETHATTAKESADVANTAGEOFEACHBROWSERSUNIQUEFEATURESITCANALSOTELLIFACLIENTOTHERTHANANHTMLBROWSERISUSED,SUCHASAWIRELESSMARKUPLANGUAGEWMLBROWSERONACELLPHONEORAPDADEVICE,ANDGENERATEANAPPROPRIATERESPONSETHEACCEPTHEADERSPROVIDEINFORMATIONABOUTTHELANGUAGESANDFILEFORMATSTHEBROWSERACCEPTSTHESEHEADERSCANBEUSEDTOADJUSTTHERESPONSETOTHECAPABILITIESOFTHEBROWSERANDTHEUSERSPREFERENCES,SUCHASUSEASUPPORTEDIMAGEFORMATANDTHEPREFERREDLANGUAGETHESEAREJUSTAFEWOFTHEHEADERSTHATCANBEINCLUDEDINAREQUESTMESSAGETHERESOURCEIDENTIFIERURIDOESNTNECESSARILYCORRESPONDTOASTATICFILEONTHESERVERITCANIDENTIFYANEXECUTABLEPROGRAM,ARECORDINADATABASE,ORPRETTYMUCHANYTHINGTHEWEBSERVERKNOWSABOUTTHATSWHYTHEGENERICTERMRESOURCEISUSEDINFACT,THERESNOWAYTOTELLIFTHE/INDEXHTMLURICORRESPONDSTOAFILEORSOMETHINGELSEITSJUSTANAMETHATMEANSSOMETHINGTOTHESERVERTHEWEBSERVERISCONFIGUREDTOMAPTHESEUNIQUENAMESTOTHEREALRESOURCES2RESPONSESINDETAILWHENTHEWEBSERVERRECEIVESTHEREQUEST,ITLOOKSATTHEURIANDDECIDES,BASEDONCONFIGURATIONINFORMATION,HOWTOHANDLEITITMAYHANDLEITINTERNALLYBYSIMPLYREADINGANHTMLFILEFROMTHEFILESYSTEM,ORITCANFORWARDTHEREQUESTTOSOMECOMPONENTTHATISRESPONSIBLEFORTHERESOURCECORRESPONDINGTOTHEURITHISCANBEAPROGRAMTHATUSESDATABASEINFORMATION,FORINSTANCE,TODYNAMICALLYGENERATEANAPPROPRIATERESPONSETOTHEBROWSERITMAKESNODIFFERENCEHOWTHEREQUESTISHANDLEDALLITCARESABOUTISGETTINGARESPONSETHERESPONSEMESSAGELOOKSSIMILARTOTHEREQUESTMESSAGEITCONSISTSOFTHREETHINGSASTATUSLINE,RESPONSEHEADERS,ANDANOPTIONALRESPONSEBODYHERESANEXAMPLEHTTP/11200OKLASTMODIFIEDMON,20DEC2002232642GMTDATETUE,11JAN2003205240GMTSTATUS200CONTENTTYPETEXT/HTMLSERVLETENGINETOMCATWEBSERVER/50CONTENTLENGTH59A23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A214HELLOWORLDTHESTATUSLINESTARTSWITHTHENAMEOFTHEPROTOCOL,FOLLOWEDBYASTATUSCODEANDASHORTDESCRIPTIONOFTHESTATUSCODEHERETHESTATUSCODEIS200,MEANINGTHEREQUESTWASEXECUTEDSUCCESSFULLYTHERESPONSEMESSAGEHASHEADERSJUSTLIKETHEREQUESTMESSAGEINTHISEXAMPLE,THELASTMODIFIEDHEADERGIVESTHEDATEANDTIMEFORWHENTHERESOURCEWASLASTMODIFIEDTHEBROWSERCANUSETHISINFORMATIONASATIMESTAMPINALOCALCACHETHENEXTTIMETHEUSERASKSFORTHISRESOURCE,HECANASKTHESERVERTOSENDITONLYIFITSBEENUPDATEDSINCETHELASTTIMEITWASREQUESTEDTHECONTENTTYPEHEADERTELLSTHEBROWSERWHATTYPEOFRESPONSEDATATHEBODYCONTAINSANDTHECONTENTLENGTHHEADERHOWLARGEITISTHEOTHERHEADERSARESELFEXPLANATORYABLANKLINESEPARATESTHEHEADERSFROMTHEMESSAGEBODYHERETHEBODYISASIMPLEHTMLPAGEHELLOWORLDOFCOURSE,THEBODYCANCONTAINAMORECOMPLEXHTMLPAGEORANYOTHERTYPEOFCONTENTFOREXAMPLE,THEREQUESTMAYRETURNANHTMLPAGEWITHELEMENTSWHENTHEBROWSERREADSTHEFIRSTRESPONSEANDFINDSTHEELEMENTS,ITSENDSANEWREQUESTFORTHERESOURCEIDENTIFIEDBYEACHELEMENT,OFTENINPARALLELTHESERVERRETURNSONERESPONSEFOREACHIMAGEREQUEST,WITHACONTENTTYPEHEADERTELLINGWHATTYPEOFIMAGEITISFORINSTANCEIMAGE/GIFANDTHEBODYCONTAININGTHEBYTESTHATMAKEUPTHEIMAGETHEBROWSERTHENCOMBINESALLRESPONSESTORENDERTHECOMPLETEPAGE3REQUESTPARAMETERSBESIDESTHEURIANDHEADERS,AREQUESTMESSAGECANCONTAINADDITIONALINFORMATIONINTHEFORMOFPARAMETERSIFTHEURIIDENTIFIESASERVERSIDEPROGRAMFORDISPLAYINGWEATHERINFORMATION,FOREXAMPLE,REQUESTPARAMETERSCANPROVIDEINFORMATIONABOUTTHECITYTHEUSERWANTSTOSEEAFORECASTFORINANECOMMERCEAPPLICATION,THEURIMAYIDENTIFYAPROGRAMTHATA23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A215PROCESSESORDERS,WITHTHEUSERSCUSTOMERNUMBERANDTHELISTOFITEMSTOBEPURCHASEDTRANSFERREDASPARAMETERSPARAMETERSCANBESENTINONEOFTWOWAYSTACKEDONTOTHEURIINTHEFORMOFAQUERYSTRINGORSENTASPARTOFTHEREQUESTMESSAGEBODYTHISISANEXAMPLEOFAURLWITHAQUERYSTRINGHTTP/WWWWEATHERCOM/FORECASTCITYHERMOSABEACHFORINSTANCE,AQUESTIONMARKISENCODEDAS3FWHENPARAMETERSARESENTASPARTOFTHEREQUESTBODY,THEYFOLLOWTHESAMESYNTAXURLENCODEDNAME/VALUEPAIRSSEPARATEDBYAMPERSANDS错误未指定书签。4REQUESTMETHODSASDESCRIBEDEARLIER,GETISTHEMOSTCOMMONLYUSEDREQUESTMETHOD,INTENDEDTORETRIEVEARESOURCEWITHOUTCAUSINGANYTHINGELSETOHAPPENONTHESERVERTHEPOSTMETHODISALMOSTASCOMMONASGETITREQUESTSSOMEKINDOFPROCESSINGONTHESERVER,FORINSTANCE,UPDATINGADATABASEORPROCESSINGAPURCHASEORDERTHEWAYPARAMETERSARETRANSFERREDISONEOFTHEMOSTOBVIOUSDIFFERENCESBETWEENTHEGETANDPOSTREQUESTMETHODSAGETREQUESTALWAYSUSESAQUERYSTRINGTOSENDPARAMETERVALUES,WHILEAPOSTREQUESTALWAYSSENDSTHEMASPARTOFTHEBODYADDITIONALLY,ITCANSENDSOMEPARAMETERSASAQUERYSTRING,JUSTTOMAKELIFEINTERESTINGIFYOUINSERTALINKINANHTMLPAGEUSINGANELEMENT,CLICKINGONTHELINKRESULTSINAGETREQUESTBEINGSENTTOTHESERVERSINCETHEGETREQUESTUSESAQUERYSTRINGTOPASSPARAMETERS,YOUCANINCLUDEHARDCODEDPARAMETERVALUESINTHELINKURIHERMOSABEACHWEATHERFORECASTWHENYOUUSEAFORMTOSENDUSERINPUTTOTHESERVER,YOUCANSPECIFYWHETHERTOUSETHEA23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A216GETORPOSTMETHODWITHTHEMETHODATTRIBUTE,ASSHOWNHERECITYSTATEIFTHEUSERENTERS“HERMOSABEACH“AND“CA“INTHEFORMFIELDSANDCLICKSONTHESUBMITBUTTON,THEBROWSERSENDSAREQUESTMESSAGELIKETHISTOTHESERVERPOST/FORECASTHTTP/11HOSTWWWGEFIONSOFTWARECOMUSERAGENTMOZILLA/50WINDOWSUWIN9X490ENUSRV102ACCEPTIMAGE/GIF,IMAGE/JPEG,IMAGE/PJPEG,IMAGE/PNG,/ACCEPTLANGUAGEENUSACCEPTCHARSETISO88591,UTF8CITYHERMOSABEACHTHEBROWSERWOULDHAVETOSAVEBOTHTHEURIANDTHEREQUESTMESSAGEBODYSINCEAPOSTREQUESTISINTENDEDTOPERFORMSOMEPOSSIBLYIRREVERSIBLEACTIONONTHESERVER,THEBROWSERMUSTALSOASKTHEUSERIFITSOKAYTOSENDTHEREQUESTAGAINBESIDESTHEGETANDPOSTMETHODS,HTTPSPECIFIESTHEFOLLOWINGMETHODSOPTIONSTHEOPTIONSMETHODISUSEDTOFINDOUTWHATOPTIONSEG,METHODSASERVERORARESOURCEOFFERSHEADA23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A217THEHEADMETHODISUSEDTOGETARESPONSEWITHALLHEADERSGENERATEDBYAGETREQUESTBUTWITHOUTTHEBODYITCANMAKESUREALINKISVALIDORTOSEEWHENARESOURCEWASLASTMODIFIEDPUTTHEPUTMETHODISUSEDTOSTORETHEMESSAGEBODYCONTENTONTHESERVERASARESOURCEIDENTIFIEDBYTHEURIDELETETHEDELETEMETHODISUSEDTODELETETHERESOURCEIDENTIFIEDBYTHEURITRACETHETRACEMETHODISUSEDFORTESTINGTHECOMMUNICATIONBETWEENTHECLIENTANDTHESERVERTHESERVERSENDSBACKTHEREQUESTMESSAGE,EXACTLYASITRECEIVEDIT,ASTHEBODYOFTHERESPONSEA23A23A23A6A9A10A11A12A13A14A9A15A16A17A18A18A19A20A218HTTP请求/响应模型JSPA15A16A24A25A26A27A28A29A30A22A31A32A33A341详叙REQUESTS让我们仔细看看REQUESTS。用户发送请求到服务器，通过点击一个链接的网页上，提交表单时，或输入一个网页地址在浏览器的地址栏。发送请求后，浏览器需要知道与哪些服务器交换数据，并要求得到资源。URL必须跟据服务器名详细描术端口号,例如HTTP/WWWGEFIONSOFTWARECOM/INDEXHTML第一部分所显示的URL中指定的REQUESTS是使用HTTP协议的。其次是服务器的名称，在这种情况下WWWGEFIONSOFTWARECOM。WEB服务器等待请求将在某一特定的TCP/IP端口。端口号80是标准端口，用于HTTP请求。如果WEB服务器使用另一个端口，URL必须跟据服务器名称指定端口号。例如HTTP/WWWGEFIONSOFTWARECOM8080/INDEXHTML这一请求被发送到一台服务器，使用端口8080而不是80。最后部分的URL,/INDEXHTML,确定了客户端请求的资源。网址实际上是一个专业化的统一资源标识符（URI，所界定的符G2524RFC2396G16280G7696G709。URL跟据地址确定部G1233资源，例如服务器，其中G2265G2559的资源。另一种G12879G3423的URI是一个统一资源名称（URNG709，这是一个G1852G4628G2819一标识符,G7092G16782在G1172G1052地G7053G18129G7389G6940的资源的G1313G13634。HTTPG2494G3800G10714URL的不G2528。G16825G7477G8466的URIG2656URLG5132G5132被G1126换，不G5196的是，G1194们G7389不G2528的定G1053G11065G7389不G2528的G16280G7696。我G16809G3282使用G7477G8466所界定的HTTP/11G16280G14551（符G2524RFC2616G5192G709，这是G11468G5415接G17829，G1209G1194们是如G1321G1075用在SERVLETG2656JSPG16280G14551。G3252G8504，我G2494G7389G5415URIG1209HTTPG5332G3848时G6177使用的TERMURL（或HTTPS，G1038HTTPG2164G4506G17842G13459G709，其次是服务器名称，并G2499G14033G7389一个端口号，如G1209G2081的例G4388。我使用的URIG1328G1038一个通用术G16833的G1231G1321G4395符G1030，确定了资源，确定G1313G13634G2499G1209G1186上下G7003而不G13793要URI。例如，G5415请求G5062被交G1196G13485服务器，G1313G13634G5062G13475定确，G2494G7389资源标识符是G5468G18337要的。浏览器使用URLG1461G5699G2031G17908的请求G9052G5699使用指定的协议发送到指定的服务器。HTTP请求G9052G5699G11013G989部G1233G13464G6116一个请求G15904，请求标G3848，请求G1319。请求G15904G1209G7053G8873名称的G5332G3848，G19555后G17839G15904了资源标识符G2656协议G10268G7424所使用的浏览器A35A35A35A36A37A38A39A40A41A42A37A43A44A45A46A46A47A48A499GET/INDEXHTMLHTTP/11最G5132用的G7053G8873是GET。G20050名G5617G1053，GET请求用于G1186服务器G7828G13046资源。这是G21676G16760的请求G7053G8873，G3252G8504，如果G5756输入网址在浏览器的地址栏，或G13785点击一个链接，发送的请求是G1328G1038一个GET请求到服务器。标G20076要求提G1391G20081G3818的G1461G5699G2499G1209使用服务器G7481G3800G10714请求。G18050G1226G8503G7003是G2494G2265G2559在某些G12879G3423的REQUESTS，如POST请求G1209后G16764G16782。下G19766是一个例G4388，一个G7389G6940的HTTP请求G9052G5699GET/INDEXHTMLHTTP/11HOSTWWWGEFIONSOFTWARECOM用户G1207G10714MOZILLA/50WINDOWSUWIN9X490ENUSRV102接G2475IMAGE/GIF,IMAGE/JPEG,IMAGE/PJPEG,IMAGE/PNG,/接G2475G16833G16340EN接G2475G4395符ISO88591,UTF8请求G15904指定的GETG7053G8873G2656要求的资源G2641名/INDEXHTML使用HTTP/11协议G17832G3250。不G2528的G3848提G1391不G2528的资G7021。G1039G7438标G3848使用URLG2590G16797服务器G1039G7438名。服务器G2499G14033G7389G3822个名称，G3252G8504这一G1461G5699是用G7481G2318分G3822个G15406G6323的网G13488服务器G1861G1151G11468G2528的WEB服务器G17839G12255。USERAGENT标G20076G2265G2559G7389关G12879G3423的浏览器提出请求。服务器G2499G1209用它G7481传送不G2528G12879G3423的反应，不G2528G12879G3423的浏览器。例如，如果服务器知道是使用INTERNETEXPLORER或NETSCAPENAVIGATOR，它G2499G1209发出一个反应，充分利用每一个浏览器的独特功G14033。它G1075G2499G1209判断客户端G1209G3818的HTML浏览器使用，如G7092G13459标记G16833G16340（标记G16833G16340G709的浏览器的手G7438或PDA设备，并产生适G5415的反应。请求G3848提G1391G7389关的G16833G16340G2656G7003G1226G7696式的浏览器。这些标G20076G2499G1209用G7481适应不G2528功G14033的浏览器G2656不G2528的用户，如使用了一个G2475支持的G3282像G7696式G2656首选G16833G16340。这些G2494是一小部分的标G20076中G2499G1209G2265G2559请求的G1461G5699。资源标识符（URIG709，并不一定对应于一个静态G7003G1226在服务器上。它G2499G1209识别一个G2499执G15904的G12255序，记录在一个数据库中，或差不G3822G1231G1321WEB服务器知道。这就是通用术G16833资源的使用。事实上，就没G7389办G8873判断/INDEXHTML的通用资源识别符对应的G7003G1226还是其G1194G1172G1052东西，它G2494是一个名G4395，这意味着一些服务器。WEB服务器被配G13634G1038地G3282这些指定的名称对应指定的资源。2祥叙RESPONSEA50A50A50A51A52A53A54A55A56A57A52A58A59A60A61A61A62A63A6410G5415WEB服务器收到请求，在URI的其础上决定，用配G13634G1461G5699G7481G3800G10714它。它G2499G1209G3800G10714简单的HTMLG7003G1226，G1075G2499G1209将申请转交G13485一些G13464G6116部分，负责G11468应的资源URI。这G2499G14033是一个G12255序使用的数据库G1461G5699，例如，动态生G6116一个适G5415的反应。在浏览器没G7389差别时RESPONSE是如G1321G3800G10714的一切关心的就得到了答复。在G3250复G18050G1226看起G7481G12879似请求G9052G5699。它G2265括G989G1226事一个状态G15904，响应G3848，G2656一个G2499选的反应G7438构。下G19766是一个例G4388HTTP/11200OKLASTMODIFIEDMON,20DEC2002232642GMTDATETUE,11JAN2003205240GMTSTATUS200CONTENTTYPETEXT/HTMLSERVLETENGINETOMCATWEBSERVER/50CONTENTLENGTH59HELLOWORLD状态G15904G5332G3848的名称协议，其次是状态G1207码，并G7389简短的描述状态G1207码。在这里，状态G1207码是200，这意味着被执G15904的请求G6116功。G3250应G18050G1226标G20076就像请求G9052G5699。在这个例G4388中，最后修改标G20076G13485出的日期G2656时间，资源最后修改。G16825浏览器G2499G1209使用G8504G1461G5699G1328G1038一个时间戳在G7424地缓存下一次用户要求这一资源，G1194G2499G1209向服务器发送它G2494要G5415它被更新，G3252G1038这是最后一次要求。内容G12879G3423标G3848讲述了G1172G1052G12879G3423的浏览器的反应数据G2656身G1319G2265G2559的内容长度标G20076是G3822G1052大。其G1194标G20076不G16340自明。一个空G15904分隔标G20076的G18050G1226G8503G7003。在这里，内容G1319是一个简单的HTML网页HTMLHELLOWORLDG5415然，人G1319G2499G1209G2265G2559一个更G1038复杂的HTML网页或G1231G1321其G1194G12879G3423的内容。例如，请求G2499G14033会G17832G3250一个HTML页G19766的IMG要素。G5415浏览器读取第一个反应时，并G16760G1038是IMG要素，它就发出了一个新的要求所确定的资源，往往是在平G15904。服务器G17832G3250一个响应，A65A65A65A66A67A68A69A70A71A72A67A73A74A75A76A76A77A78A7911每幅G3282像的要求，与内容G12879G3423标G20076G2590G16797G1172G1052G12879G3423的影像（例如G3282片/GIFG7696式G709，G1319内G2559G7389G4395节构G6116的G12879G3423。3请求参数除了URIG2656标G20076，一个请求G9052G5699G2499G1209G2265G2559更G3822G1461G5699的形式参数。如果确定了的URI服务器端G12255序显示天气G1461G5699，例如，请求参数G2499G1209提G1391G7389关城市的用户希望看到一个预测。电G4388商务的应用，G5332放的我们G2499G14033会确定一个G12255序，G3800G10714订单，与用户的客户数量G2656名单所要采购的物品转移G1328G1038参数。参数G2499G1209发出两种G7053式G1055一G8731G1227上的URI形式的G7609G16822G4395符G1030或发出的一部分，请求G18050G1226G8503G7003。这是一个例G4388，一个网址的G7609G16822G4395G1030HTTP/WWWWEATHERCOM/FORECASTCITYHERMOSABEACHURLG13546码名称/G1552对分隔符号。4请求方法如G2081所述，得到的是最G5132用的请求G7053G8873，G7100在G14731