HttpClient 和 LocalServerTestBase 真的很慢

Question

我正在尝试在使用HttpClient 版本4.5 的类上编写测试。我写的测试真的很慢，所以我试图隔离问题。我可以编写一个测试来证明我的问题：

public class RequeteurRESTTest extends LocalServerTestBase {

    private String startServer(String urlSuffix, HttpRequestHandler handler) throws Exception{
        this.serverBootstrap.registerHandler(urlSuffix, handler);
        HttpHost target = start();
        String serverUrl = "http://localhost:" + target.getPort();
        return serverUrl;
    }

    @Test
    public void testCase() throws Exception{
        String baseURL = startServer("/api", new HttpRequestHandler() {
            @Override
            public void handle(HttpRequest request, HttpResponse response,     HttpContext context) throws HttpException, IOException {
                response.setStatusCode(HttpStatus.SC_OK);
            }
        });

        HttpClient httpClient;
        httpClient = HttpClients.custom().build();

        HttpGet method = new HttpGet(baseURL + "/api");
        HttpResponse response = httpClient.execute(method);
    }
}

我遇到的问题是指令：

httpClient.execute(method)

执行需要 10 秒。这很慢，但我不明白为什么这么慢。我是否在测试中犯了任何错误，或者忘记了什么？

Answer 1

这很可能是因为您没有对响应对象执行任何操作。至少应该关闭它。

Answer 2

由于我无法理解的原因，使用基类的httpclient可以正常工作，如下：

@Test
public void testCase() throws Exception{
    String baseURL = startServer("/api", new HttpRequestHandler() {
        @Override
        public void handle(HttpRequest request, HttpResponse response,     HttpContext context) throws HttpException, IOException {
            response.setStatusCode(HttpStatus.SC_OK);
        }
    });

    HttpGet method = new HttpGet(baseURL + "/api");
    HttpResponse response = this.httpclient.execute(method);

}

Answer 3

如果你查看LocalServerTestBase类的源代码，你可以看到如下方法：

@After
public void shutDown() throws Exception {
    if(this.httpclient != null) {
        this.httpclient.close();
    }

    if(this.server != null) {
        this.server.shutdown(10L, TimeUnit.SECONDS);
    }

}

通过在您自己的测试用例中覆盖它，您可以将超时设置为 0 秒。这应该可以消除您在执行中看到的延迟。

示例实现：

public class MyClassTest extends LocalServerTestBase{
    HttpHost httpHost;
    @Before
    public void setUp() throws Exception {
      super.setUp();
      this.serverBootstrap.registerHandler("/*", new HttpRequestHandler() {
        @Override
        public void handle(HttpRequest request, HttpResponse response, HttpContext context) 
                          throws HttpException, IOException {
            System.out.println(request.getRequestLine().getMethod());
            response.setStatusCode(HttpStatus.SC_OK);                
        }

      });

      httpHost = start();

    }

    @Test
    public void myMethodTest() throws Exception {
        //Create an instance and give the server url it should call
        MyClass instance = new MyClass(httpHost.toURI());
        //Test method that calls the server
        instance.myMethod();
    }

    @After @Override
    public void shutDown() throws Exception {
     if(this.httpclient != null) {
        this.httpclient.close();
     }
    if(this.server != null) {
        this.server.shutdown(0L, TimeUnit.SECONDS);
    }
   }

}

Answer 4

我遇到了同样的问题。原因似乎是请求完成后服务器没有关闭连接。我不确定这是否是测试的特殊行为，或者当您与真实服务器通信时也会发生。在我的谷歌搜索中，我发现关闭连接客户端并不常见/不容易支持，这让我相信这种连接不关闭只是测试行为。当我将测试服务器设置为从不重用连接时，它为我解决了 10 秒的延迟。

this.serverBootstrap.setConnectionReuseStrategy((response, context) -> false);