21_web servers

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1、Chapter21–WebServers(IISandApache)Outline21.1Introduction21.2HTTPRequestTypes21.3SystemArchitecture21.4Client-SideScriptingversusServer-SideScripting21.5AccessingWebServers21.6MicrosoftInternetInformationServices(IIS)21.6.1MicrosoftInternetInformationServices(IIS)5.0

2、21.6.2MicrosoftInternetInformationServices(IIS)6.021.7ApacheWebServer21.8RequestingDocuments21.8.1XHTML21.8.2ASP.NET21.8.3Perl21.8.4PHP21.8.5Python21.9WebResourcesObjectivesInthislesson,youwilllearn:TounderstandaWebserver’sfunctionality.TointroduceMicrosoftInternetInf

3、ormationServices(IIS)andApacheWebserver.TolearnhowtorequestdocumentsfromaWebserver.21.1  IntroductionWebserverRespondstoclientrequestsbyprovidingresourcesURI(UniformResourceIdentifier)Webserverandclientcommunicatewithplatform-independentHypertextTransferProtocol(HTTP)

4、21.1  Introduction21.2  HTTPRequestTypesRequestmethodsgetpostRetrieveandsendclientformdatatoWebserverPostdatatoaserver-sideformhandler21.3  SystemArchitectureMulti-tierapplication(n-tierapplication)Informationtier(dataorbottomtier)MaintainsdatafortheapplicationStoresd

5、atainarelationaldatabasemanagementsystem(RDBMS)MiddletierImplementsbusinesslogicandpresentationlogicControlinteractionsbetweenapplicationclientsandapplicationdataClienttier(toptier)Application’suserinterfaceUsersinteractdirectlywiththeapplicationthroughtheclienttier21

6、.4  Client-SideScriptingversusServer-SideScriptingClient-sidescriptsValidateuserinputReducerequestsneededtobepassedtoserverAccessbrowserEnhanceWebpageswithDHTML,ActiveXcontrols,andappletsServer-sidescriptsExecutedonserverGeneratecustomresponseforclientsWiderangeofprog

7、rammaticcapabilitiesAccesstoserver-sidesoftwarethatextendsserverfunctionality21.5  AccessingWebServersRequestdocumentsfromWebserversHostnamesLocalWebserversAccessthroughmachinenameorlocalhostRemoteWebserversAccessthroughmachinenameDomainnameorInternetProtocol(IP)addre

8、ssDomainnameserver(DNS)ComputerthatmaintainsadatabaseofhostnamesandtheircorrespondingIPaddress21.6  MicrosoftInternetInforma