Question

我正在使用apache http客户端连接到远程服务器。远程服务器发送重定向，我想实现我的客户端没有自动跟踪重定向，以便我可以提取propper标头并做任何我想要的目标。

我正在寻找简单的工作代码示例（复制粘贴）停止自动重定向跟随行为。

我找到了Preventing HttpClient 4 from following redirect，但是用HttpClient 4.0（GA）实现它似乎太愚蠢了

Answer 1

感谢macbirdie ，神奇的是：

params.setParameter("http.protocol.handle-redirects",false);

省略了进口，这是一个复制粘贴样本：

HttpClient httpclient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();

// HTTP parameters stores header etc.
HttpParams params = new BasicHttpParams();
params.setParameter("http.protocol.handle-redirects",false);

// Create a local instance of cookie store
CookieStore cookieStore = new BasicCookieStore();

// Bind custom cookie store to the local context
localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);

// connect and receive 
HttpGet httpget = new HttpGet("http://localhost/web/redirect");
httpget.setParams(params);
response = httpclient.execute(httpget, localContext);

// obtain redirect target
Header locationHeader = response.getFirstHeader("location");
if (locationHeader != null) {
    redirectLocation = locationHeader.getValue();
  System.out.println("loaction: " + redirectLocation);
} else {
  // The response is invalid and did not provide the new location for
  // the resource.  Report an error or possibly handle the response
  // like a 404 Not Found error.
}

Answer 2

这对我有用：

HttpGet httpGet = new HttpGet("www.google.com");
HttpParams params = httpGet.getParams();
params.setParameter(ClientPNames.HANDLE_REDIRECTS, Boolean.FALSE);
httpGet.setParams(params);

Answer 3

使用HttpClient 4.3和Fluent：

final String url = "http://...";
final HttpClient client = HttpClientBuilder.create()
    .disableRedirectHandling()
    .build();
final Executor executor = Executor.newInstance(client);
final HttpResponse response = executor.execute(Request.Get(url))
    .returnResponse();

Answer 4

默认HttpClient实现在可配置性方面非常有限，但您可以使用HttpClient的布尔参数http.protocol.handle-redirects来控制重定向处理。

请参阅docs以供参考。

Answer 5

不是直接使用该属性，而是可以使用：

final HttpParams params = new BasicHttpParams();
HttpClientParams.setRedirecting(params, false);

Answer 6

GetMethod method = new GetMethod(url);
method.setFollowRedirects(false);

Answer 7

要避免自动重定向标头，必须首先将请求配置为不执行自动重定向。您可以致电HttPClientParams.setRedirection并将其设为false来执行此操作。代码段如下所示：

HttpPost postURL = new HttpPost(resourceURL);
...
HttpClientParams.setRedirecting(postURL.getParams(), false);

Answer 8

在HttpClient 4.3之前

在旧版本的Http客户端（4.3之前）中，我们可以配置客户端使用重定向执行的操作，如下所示：

@Test
public void givenRedirectsAreDisabled_whenConsumingUrlWhichRedirects_thenNotRedirected() 
  throws ClientProtocolException, IOException {
    DefaultHttpClient instance = new DefaultHttpClient();

    HttpParams params = new BasicHttpParams();
    params.setParameter(ClientPNames.HANDLE_REDIRECTS, false);
    // HttpClientParams.setRedirecting(params, false); // alternative

    HttpGet httpGet = new HttpGet("http:/testabc.com");
    httpGet.setParams(params);
    CloseableHttpResponse response = instance.execute(httpGet);

    assertThat(response.getStatusLine().getStatusCode(), equalTo(301));
}

请注意可用于配置重定向行为的替代API，而不使用设置实际原始http.protocol.handle-redirects参数：

HttpClientParams.setRedirecting(params, false);

另请注意，如果禁用了跟随重定向，我们现在可以检查Http响应状态代码是否确实301已永久移动 - 应该是这样。

在HttpClient 4.3之后

HttpClient 4.3引入了更清晰，更高级别的API 来构建和配置客户端：

@Test
public void givenRedirectsAreDisabled_whenConsumingUrlWhichRedirects_thenNotRedirected() 
  throws ClientProtocolException, IOException {
    HttpClient instance = HttpClientBuilder.create().disableRedirectHandling().build();
    HttpResponse response = instance.execute(new HttpGet("http://testabc.com"));

    assertThat(response.getStatusLine().getStatusCode(), equalTo(301));
}

请注意，新API会使用此重定向行为配置整个客户端 - 而不仅仅是单个请求。参考：http://www.baeldung.com/httpclient-stop-follow-redirect

Answer 9

而不是直接调用HttpClientBuilder，可以使用

HttpClients.custom().disableRedirectHandling().build();

Answer 10

对于HttURLConnection，他们暴露了一个api。因此，如果它检测到任何自动重定向，那么它将返回302响应代码而不是200.因此，通过跟踪响应代码，我们可以轻松跟踪它是否是重定向Url。

HttpURLConnection httpURLConnection = (HttpURLConnection) (new URL("http://www.redirecturl.com").openConnection());
httpURLConnection.setInstanceFollowRedirects(false);
httpURLConnection.connect();
int responseCode = httpURLConnection.getResponseCode(); //302 in case of redirection.

Answer 11

这对我有用 CloseableHttpClient client = HttpClientBuilder.create（）。disableRedirectHandling（）。build（）;

如何防止apache http客户端跟随重定向

11 个答案: