How to dynamically set Method type and content of a request

I am newbie here. I have below two questions.

(1) How to set Method type without annotation? Is there any such method which can set the request method i.e. POST/GET?

(2) Most of our REST service, take JSON data as input. How I can set this JSON data without annotation? Since I need to pass these JSON data from an external file dynamically,so I can't use annotation. I saw a sample code here (https://github.com/andreasmihm/restfuse/blob/master/com.eclipsesource.restfuse.example/src/com/eclipsesource/restfuse/example/DynamicBodyTest.java) but I am using latest build of restfuse and unable to get RequestContext.setDynamicBody(String) method.

Please help.