public MockClient add(RequestKey requestKey, int status, byte[] responseBody) {
    return add(
        requestKey,
        Response.builder()
            .status(status)
            .reason("Mocked")
            .headers(RequestHeaders.EMPTY)
            .body(responseBody));
  }
@param response
    <ul>
      <li>the status defaults to 0, not 200!
      <li>the internal feign-code requires the headers to be set
    </ul>
mock/src/main/java/feign/mock/MockClient.java