HttpClient 4.1 并不总是返回主机值

发布于 2024-10-19 06:09:58 字数 838 浏览 1 评论 0原文

如果运行以下代码，完成后您将看到 URI 的 Host 值为“null”。这是无效的！执行请求后，它应该始终有一个 URI。

我试图在请求页面后从上下文中获取当前页面（以防发生重定向）。

对于造成的混乱，我深表歉意。我提到重定向是因为我认为这有助于更轻松地说明我的问题。下面的代码应该适用于重定向的页面和未重定向的页面。

插入您最喜欢的网站，没关系。最终的解决方案必须适用于任何网站......那些被重定向的网站和那些没有重定向的网站。

我缺少什么？

public static void main(String args[]) throws ClientProtocolException, IOException
{
    HttpParams httpParams = new BasicHttpParams();
    HttpClient httpclient = new DefaultHttpClient(httpParams);
    HttpGet httpGet = new HttpGet("http://www.google.com/");
    HttpContext context = new BasicHttpContext();
    httpclient.execute(httpGet, context);
    HttpUriRequest currentReq = (HttpUriRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);
    System.out.println("New URI host (why is it null?): " + currentReq.getURI().getHost());
}

原文

If you run the following code, you will see that the URI has a value of "null" for Host upon completion. This is invalid! It should always have a URI after executing a request.

I am trying to get the current page from the context after the page is requested (in case redirects occurred).

I apologize for the confusion. I mentioned the redirect because I thought it would help illustrate my problem more easily. The code below should work for pages that were redirected and those that were not.

Plug in your favorite site, it doesn't matter. The final solution has to work for ANY site... those that were redirected and those that were not.

What am I missing?

public static void main(String args[]) throws ClientProtocolException, IOException
{
    HttpParams httpParams = new BasicHttpParams();
    HttpClient httpclient = new DefaultHttpClient(httpParams);
    HttpGet httpGet = new HttpGet("http://www.google.com/");
    HttpContext context = new BasicHttpContext();
    httpclient.execute(httpGet, context);
    HttpUriRequest currentReq = (HttpUriRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);
    System.out.println("New URI host (why is it null?): " + currentReq.getURI().getHost());
}

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暮凉 2024-10-26 06:09:58

来自文档（http://hc.apache.org/httpcomponents-client-ga/tutorial/html/httpagent.html）

DefaultHttpClient httpclient = new DefaultHttpClient();

HttpContext localContext = new BasicHttpContext();
HttpGet httpget = new HttpGet("http://localhost:8080/"); 
HttpResponse response = httpclient.execute(httpget, localContext);
// here:
HttpHost target = (HttpHost) localContext.getAttribute(
        ExecutionContext.HTTP_TARGET_HOST);

From the docs (http://hc.apache.org/httpcomponents-client-ga/tutorial/html/httpagent.html)

DefaultHttpClient httpclient = new DefaultHttpClient();

HttpContext localContext = new BasicHttpContext();
HttpGet httpget = new HttpGet("http://localhost:8080/"); 
HttpResponse response = httpclient.execute(httpget, localContext);
// here:
HttpHost target = (HttpHost) localContext.getAttribute(
        ExecutionContext.HTTP_TARGET_HOST);

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