This is implemented for ADStudio 11.0.3-4 and ADServer 2.0.0-1.  We need to test it and write simple examples.

var headerNames = aqua.request.getHeaderNames();
var headerValue = aqua.request.getHeader("referer");
var headerValues = aqua.request.getHeaders("Accept");

print("Header Names:");
if (headerNames != null) {
for (var i=0; i < headerNames.length; i++) {
print(headerNames[i]);
}
}
print("--");

print("Header value: " + headerValue+"\n");
print("Header Values:");
if (headerValues != null) {
for (var i=0; i < headerValues.length; i++)
  {
    print(headerValues[i]);
  }
}
print("--");
print("COOKIES");

// get cookie
var cookie = aqua.request.getCookies();
  for (var i = 0; i < cookie.length; i++)
         {
           aqua.console.println('cookies' +' : '+ cookie[i].getName())    ;
           aqua.console.println('cookies' +' : '+ cookie[i].getValue())   ;
           aqua.console.println('cookies' +' : '+ cookie[i].getPath())    ;
           aqua.console.println('cookies' +' : '+ cookie[i].getVersion()) ;
           aqua.console.println('cookies' +' : '+ cookie[i].getSecure())  ;
           aqua.console.println('cookies' +' : '+ cookie[i].getDomain())  ;
           aqua.console.println('cookies' +' : '+ cookie[i].getMaxAge())  ;
           aqua.console.println('--') ;
          }