Question

我正在使用apache http客户端来测试我的WS。我在球衣上写了一个WS。此WS的URL是

http://localhost:8080/mobilestore/rest/sysgestockmobilews/getinventory?xml=dataString

使用url调用此WS我已经编写了一个方法，如下所示

public static void getInventory(String input)
        throws ClientProtocolException, IOException {

    System.out.println(input);
    String url = URL + "getinventory";
    HttpClient client = new DefaultHttpClient();

    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
    nameValuePairs.add(new BasicNameValuePair("xml", input));
    String paramString = URLEncodedUtils.format(nameValuePairs, "utf-8");
    url += "?" + paramString;
    System.out.println(url);
    HttpGet request = new HttpGet(url);
    HttpResponse response = client.execute(request);
    BufferedReader rd = new BufferedReader(new InputStreamReader(response
            .getEntity().getContent()));

    String line = "";
    while ((line = rd.readLine()) != null) {
        System.out.println(line);
    }

}

现在，当我运行程序并将url传递给此函数时，我在行

处获得异常

HttpResponse response = client.execute(request);

例外情况如下

Aug 14, 2013 9:31:50 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: I/O exception (org.apache.http.NoHttpResponseException) caught when processing         request: The target server failed to respond
Aug 14, 2013 9:31:50 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: Retrying request
Aug 14, 2013 9:31:50 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: I/O exception (org.apache.http.NoHttpResponseException) caught when processing   request: The target server failed to respond
Aug 14, 2013 9:31:50 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: Retrying request
Aug 14, 2013 9:31:50 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: I/O exception (org.apache.http.NoHttpResponseException) caught when processing      request: The target server failed to respond
Aug 14, 2013 9:31:50 PM org.apache.http.impl.client.DefaultRequestDirector tryExecute
INFO: Retrying request
Exception in thread "main" org.apache.http.NoHttpResponseException: The target server failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:95)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:62)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:254)
at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:289)
at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:252)
at org.apache.http.impl.conn.ManagedClientConnectionImpl.receiveResponseHeader(ManagedClientConnectionImpl.java:191)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:300)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:127)
at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:715)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:520)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
at    org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
at com.tainosystems.http.client.TestWs.getInventory(TestWs.java:66)
at com.tainosystems.http.client.TestWs.main(TestWs.java:47)

现在如果我使用WS网址并使用任何浏览器点击它我得到预期的结果但我想知道我的apache http客户端代码有什么问题..

Answer 1

我从这里浏览了链接并得到了这个答案： get NoHttpResponseException for load testing

这让我走上正轨。要在此处更新答案，请使用当前的http-client 4.5 API解决方案：

private final HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(createHttpClient());

private CloseableHttpClient createHttpClient() {
    return HttpClients.custom().setRetryHandler((exception, executionCount, context) -> {
            if (executionCount > 3) {
                LOGGER.warn("Maximum tries reached for client http pool ");
                return false;
            }
            if (exception instanceof org.apache.http.NoHttpResponseException) {
                LOGGER.warn("No response from server on " + executionCount + " call");
                return true;
            }
            return false;
        }).build();
}

我也在那里使用spring-web所以我使用客户端作为RestTemplate工厂的参数，因为我希望它在RestTemplate中使用。

Answer 2

检查您的“网址”是否具有正确的值。错误消息显示“目标服务器无法响应”。这可能是您提供的URL有错误或服务器已关闭。如果您提供了错误的参数名称/值或其他内容，则错误消息将有所不同。

apache http client org.apache.http.NoHttpResponseException：目标服务器无法响应

2 个答案: