How to get the name or ip of a proxy server in a managed network?

Question

i need to be able to access certain urls programmatically . I am using URLConnection as follows

URL url = new URL(http,         
                  myProxy.com, // I need to know this parameter   
                  -1,              
                  http://www.example.com/);    

How do I get the name of the proxy server used in a managed network.

when i use a browser like chrome it connects me with the proxy server that makes requests to the internet . How do i get the name of the proxy server ?

Answer 1

You can try to use a java ProxySelector class to do it, her is short example of it'usage from java proxy configuration guide:

private Proxy findProxy(URI uri)
{
   try
   {
      ProxySelector selector = ProxySelector.getDefault();
      List<Proxy> proxyList = selector.select(uri);
      if (proxyList.size() > 1)
           return proxyList.get(0);
   }
   catch (IllegalArgumentException e)
   {
   }
   return Proxy.NO_PROXY;
}

To get a host name and IP address, you can use an InetSocketAddress, which you can get from Proxy instance:

InetSocketAddress addr = (InetSocketAddress) proxy.address(); 
if(addr != null) { 
  System.out.println("proxy hostname : " + addr.getHostName()); 
  System.out.println("proxy port : " + addr.getPort()); 
} 

But as I know, it's needed to set a system property to do it:

System.setProperty("java.net.useSystemProxies","true");

One more solution is to use a proxy-vole library to do it. Here is some usage examples.