Java HTTPS Proxy/Redirect Server

Question

I am trying to have a server (written in java) redirect to a HTTPS url (the url will never change) when accessed. If I compile the code with

java -Djavax.net.ssl.keyStore=mySrvKeystore -Djavax.net.ssl.keyStorePassword=password ProxyServer

and enter in the address, port, and localport as

https://google.com 443 5000

And try accessing

localhost:5000

on my machine, then I get the error

java.net.UnknownHostException: https://google.com

After debugging, I am pretty sure it breaks in this code block when I try to create the SSLSocket (secureServer).

    SSLSocket secureServer;
    try { 
        SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
        secureServer = (SSLSocket) factory.createSocket(host, port);
        from_server = secureServer.getInputStream();
        to_server = secureServer.getOutputStream();
    }

Answer 1

The argument you pass as the host to factory.createSocket(host,port) must not have the protocol prepended to it. It should simply be google.com .

The reason is that Java is going to take that host parameter and pass it as input to a DNS lookup. If you were to type host https://google.com on the command line, you'd get a similar failure.

Answer 2

In here , it says this was a bug and resolved after some releases

In jdk 6 server, we get the same exception but in our jdk 8 server, no exception