如何模拟RestTemplate代理调用?

我有一个集成测试,它可以正确地模拟身份验证调用,但现在需要支持代理。我对代理没有经验,在测试这方面遇到了很多困难。

具体实施情况如下:

proxySettings.setProxy(httpClientBuilder, null);
RestTemplate restTemplate = new RestTemplate(
    new HttpComponentsClientHttpRequestFactory(httpClientBuilder.build()));

...

restTemplate.exchange(url, HttpMethod.POST, entity, type);

这个 setProxy() 方法获取一些用户配置的代理设置,并将它们应用于 HttpClientBuilder :

//Fetch user-configured proxy settings and null check before returning object
HttpHost proxyHttpHost = getHttpClientProxyHttpHost();

httpClientBuilder.setProxy(proxyHttpHost);

//If user/pass is set (credentialsProvider is just a new instance of BasicCredentialsProvider)
credentialsProvider.setCredentials(
    new AuthScope(getHttpProxyHost(), Integer.parseInt(getHttpProxyPort())),
    proxyUsernamePasswordCredentials
);
httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);

非代理版本的测试通过了以下预期:

expect().when(
    request()
        .withMethod("POST")
        .withPath("/auth")
        .withBody(
            params(
                param("client_id", clientId),
                param("client_secret", clientSecret),
                param("grant_type", grantType),
                param("scope", scope)
            ))
).respond(
    response()
        .withStatusCode(expectedResponseStatusCode)
        .withContentType(MediaType.APPLICATION_JSON)
        .withBody(json("{\"access_token\":\"ImAHappyString\"}"))
);

当我在配置了代理的情况下运行测试时(主机: proxy-host.com 港口城市 1234 )我得到以下错误:

ErrorMessage: I/O error on POST request for "http://127.0.0.1:37351/auth": proxy-host.com: Name or service not known; nested exception is java.net.UnknownHostException: proxy-host.com: Name or service not known

我试着期待一个 CONNECT 请求,但我只是得到了同样的失败。有什么建议吗?