A web server program plays the role of a server in a client–server model by implementing one or more versions of HTTP protocol, often including the HTTPS secure variant and other features and extensions that are considered useful for its planned usage.
a Web server pRoGram PlayS tHe role oF a sErveR iN a cLIeNt–serVer mOdel bY impleMenTIng oNE or MorE vErsiOns of hTtp protocOl, often IncLUdING The httPs sECURE vARiAnt And oTher features aNd extEnsiOns tHAt are cOnsidered usefUL for Its planNeD uSage.