常见的HTTPclient和代理 [英] Common HTTPclient and proxy

问题描述

我使用apache的常见httpclient库。是否有可能通过代理发出HTTP请求？更具体地说，我需要使用多线程POST请求的代理列表（现在我正在测试单线程GET请求）。

  httpclient.getHostConfiguration（）。setProxy（67.177.104.230，58720）; 
  

我得到该错误代码：

  21.03.2012。 20时49分17秒org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 
产品介绍：连接被拒绝：连接
 21.03.2012处理请求时抓住了I / O异常（java.net.ConnectException）。 20:49:17 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 
 INFO：重试请求
 21.03.2012。 20时49分19秒org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 
产品介绍：连接被拒绝：连接
 21.03.2012处理请求时抓住了I / O异常（java.net.ConnectException）。 20:49:19 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 
 INFO：重试请求
 21.03.2012。 20时49分21秒org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 
产品介绍：连接被拒绝：连接
 21.03.2012处理请求时抓住了I / O异常（java.net.ConnectException）。 20时49分21秒org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 
产品介绍：重试请求
 org.apache.commons.httpclient.ProtocolException：服务器XXXXX无法以有效的HTTP响应$ B回应$ b。在org.apache.commons.httpclient.HttpMethodBase.readStatusLine（HttpMethodBase.java:1846）在org.apache.commons.httpclient.HttpMethodBase.readResponse 
（HttpMethodBase.java:1590）
。在组织.apache.commons.httpclient.HttpMethodBase.execute（HttpMethodBase.java:995）在org.apache.commons.httpclient.ConnectMethod.execute（ConnectMethod.java:144）
 
在org.apache.commons .httpClient.HttpMethodDirector.executeConnect（HttpMethodDirector.java:495）
 at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry（HttpMethodDirector.java:390）
 at org.apache.commons.httpclient.HttpMethodDirector （HttpClient.java:396）
。在org.apache.commons.httpclient.HttpClient.executeMethod（HttpClient.java:324）
 at test.main（test.java:42）
  

当我删除该行时，所有事情都按预期运行良好。 对于httpclient 4.1.x，你可以像这样设置代理（取自

.0.1，8080，http）;

DefaultHttpClient httpclient = new DefaultHttpClient（）;
尝试{
httpclient.getParams（）。setParameter（ConnRoutePNames.DEFAULT_PROXY，proxy）;

HttpHost target = new HttpHost（issues.apache.org，443，https）;
HttpGet req = new HttpGet（/）;

System.out.println（通过+ proxy执行请求到+ target +;
HttpResponse rsp = httpclient.execute（target，req）;
...
} finally {
//当不再需要HttpClient实例时，
//关闭连接管理器以确保
//立即释放所有系统资源
httpclient.getConnectionManager（）。shutdown（）;
}

I am using apache's common httpclient library. Is it possible to make HTTP request over proxy? More specific, I need to use proxy list for multithreaded POST requests (right now I am testing with single threaded GET requests).

I tried to use:

        httpclient.getHostConfiguration().setProxy("67.177.104.230", 58720);

I get errors with that code:

21.03.2012. 20:49:17 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused: connect
21.03.2012. 20:49:17 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
21.03.2012. 20:49:19 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused: connect
21.03.2012. 20:49:19 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
21.03.2012. 20:49:21 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused: connect
21.03.2012. 20:49:21 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
org.apache.commons.httpclient.ProtocolException: The server xxxxx failed to respond with a valid HTTP response
    at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1846)
    at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1590)
    at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:995)
    at org.apache.commons.httpclient.ConnectMethod.execute(ConnectMethod.java:144)
    at org.apache.commons.httpclient.HttpMethodDirector.executeConnect(HttpMethodDirector.java:495)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:390)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
    at test.main(test.java:42)

When I remove that line, everything runs fine as expected.

解决方案

For httpclient 4.1.x you can set the proxy like this (taken from this example):

    HttpHost proxy = new HttpHost("127.0.0.1", 8080, "http");

    DefaultHttpClient httpclient = new DefaultHttpClient();
    try {
        httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

        HttpHost target = new HttpHost("issues.apache.org", 443, "https");
        HttpGet req = new HttpGet("/");

        System.out.println("executing request to " + target + " via " + proxy);
        HttpResponse rsp = httpclient.execute(target, req);
        ...
    } finally {
        // When HttpClient instance is no longer needed,
        // shut down the connection manager to ensure
        // immediate deallocation of all system resources
        httpclient.getConnectionManager().shutdown();
    }

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