MockWebServer server = new MockWebServer(); server.start(); server.enqueue(new MockResponse() .setResponseCode(200) .setBody("Hello, world!")); String url = server.url("/path").toString(); OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url(url) .build(); Response response = client.newCall(request).execute(); String responseBody = response.body().string(); System.out.println(responseBody); server.shutdown();