Set custom cookie in Pega PRPC in Java step

setCookie.java

// Cookie has to be set on 'set_cookie' property on pyHttpResponseHeaders on pxRequestor page

try {
  tools.getRequestor().getRequestorPage().getPage("pyHTTPResponseHeaders").putString("set_cookie", "PegaCustomCookie= someCookieValue; Path=/prweb; Secure; HttpOnly;");
}
catch(Exception e) {
  oLog.error("Exception while setting custom cookie" + e.getMessage());
  e.printStackTrace();
}