code: @Override
      public final <RQ, RS> Maybe<RS> postFor(String resource, RQ rq, Class<RS> clazz)
              throws RestEndpointIOException {
          return post(resource, rq, clazz).flatMap(new BodyTransformer<RS>());
      }
docs: /*
  (non-Javadoc)
  
  @see RestEndpoint#postFor(java.lang .String,
  java.lang.Object, java.lang.Class)