Set request attribute in varnish script

Question

Is it possible from varnish vcl script to set an attribute on the request and get it in the backend by java Servlet getAttribute() method? http://docs.oracle.com/javaee/6/api/javax/servlet/ServletRequest.html#getAttribute(java.lang.String)

Answer 1

Request attributes are a mechanism internal to the Servlet framework, so it is not possible to set them from the outside. It would however be possible to set a Request parameter (in either query String or request body, depending on the request type), that would then be available through HttpServletRequest.getParameter(name)