why http protocol has been introduced after generic servlet....

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JavaSE

J2EE

GenericServlet is protocol independent it means this servlet can work on any protocol where as http servlet is protocol dependent it works on only http protocol.By seeing thais i can say generic servlet has more advantages as it can work on any protocol than http sevlet as it is restricted to one protocol..Now my question then why http protocol has been introduced after generic servlet....iam novice to java.Please clarify this question.