Hello JoePao ,
${request.http.parameter.name}
Used to retrieve the value of an http parameter for the request. Request parameters are extra information sent with the request. For HTTP servlets, parameters are contained in the query string or posted form data.
for example, you have form data
p1=v1&p2=v2
to get value of p1, you can use ${request.http.parameter.p1}
Regards,
Mark