code: public IPromise postStuff1(JsonObject body, HeaderMap headerValues ) {
          headerValues.forEach( hv -> {
              Log.Info(this,""+hv.getHeaderName());
              hv.forEach( s -> {
                  Log.Info(this,"    "+s);
              });
          });
          Log.Info(this,""+body);
          return resolve(new Pair(202,body.toString()));
      }
docs: curl -i -X POST --data "{ \"key\": \"value\", \"nkey\": 13 }" http://localhost:8080/api/stuff1