confusion with the Servlets -

i new servelts programming. , today, started learning it. , little bit confused concerning

httpservletrequest. written in tutorial that, class doget() has methods such form "query" data, http request headers, , client’s hostname.

as far understood, httpservletrequest protocol allows server receive request client side. question is, why client side interesting in
knowing client’s host-name or http request headers.

if found question silly please not vote question down, because not want lose account stack overflow.

first of httpservletrequest interface implemented servlet container. httpservlet convenience class servlet can extend , hold of http specific methods. doget() 1 such method process get requests.

httpservletrequest protocol allows server receive request client side

http request-response protocol. container forms httpservletrequest object actual request received web server , forwards servlet's service() method.

why client side interesting in knowing client’s host-name or http request headers.

if talking servlets, executed in server side . hence, methods request.getheader() used servlet read headers request sent client. these headers provide information request (or response).many of headers associated request handled server itself. take, example, how server restricts access documents. server uses http headers, , servlets need not know details. when server receives request restricted page, checks request includes appropriate authorization header contains valid username , password. if doesn't, server issues response containing www-authenticate header, tell browser access resource denied. when client sends request includes proper authorization header, server grants access , gives servlet invoked access user's name via getremoteuser() call.

read http made easy, an overview of request headers.