code: public RestResponse post(final String uri, final Map<String, Object> params)
              throws IOException, AppPlatformException {
          return request(getPath(uri), HttpPost.METHOD_NAME, params);
      }
docs: This method implements an HTTP POST. Use this method to create a new resource.
  
  @param uri the URI.
  @param params the parameters.
  @return the post response.
  @throws IOException unexpected exception.
  @throws AppPlatformException unexpected exception.