code: public AsyncRestBuilder bodyForm(Form form) {
          contentType(HttpHeaders.Values.APPLICATION_X_WWW_FORM_URLENCODED);
          return bodyRaw(form.toUrlEncodedString());
      }
docs: Sets the body for the request to be an url-encoded form. This is equivalent to setting
  the {@link #contentType(String) "Content-Type"} to <code>"application/x-www-form-urlencoded"</code>
  and then setting the body via {@link #bodyRaw(String)}.
  
  @param form the {@link Form} builder object used to set form parameters.