[basex-talk] getting request's headers inside a Web Application

Dear all, I do not see an option to obtain the headers from the HTTP request from inside webapp function. Just like in the example: declare   %rest:GET   %rest:path('tests-html')   ???%rest:headers('User-Agent')???   %output:method('html') function page-main:start-empty(   ???$user-agent as xs:string??? ) as element(html) {     ... } Is this possible? BR