为什么重新安全的MockMvcRequestSpecification返回空响应体？

Question

在下面的示例中，我尝试将带有JSON正文的请求发送到模拟REST API。问题是当我尝试获取应该是JSON的响应时，它返回一个空字符串或空字符串。为什么会这样？

注意：当我将.peek（）添加到响应对象时，它将为我打印预期的结果。但我想要的是在响应对象中捕获这些结果。此外，发送的JSON字符串也是格式错误。我期待糟糕的结果，以便我可以对它们断言。

    String jsonBody = ...
    MockMvcRequestSpecification request = given()
            .header("Content-Type", this.contentType)
            .body(jsonBody);

    ResponseOptions response = given().spec(request)
            .post(this.apiUrlPath);

    //This works, I can see the status code
    assertThat(response.statusCode(), Matchers.equalTo(400));

    //This doesn't print anything, the body is always empty
    //json response is expected explaining why the request failed
    //response.peek() will print what I am expecting
    System.out.println(response.getBody().asString());