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();
    }

stevevls · Accepted Answer · 2013-11-21 01:12:59Z

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.

answered Nov 21, 2013 at 1:12

stevevls

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3 Comments

sko Over a year ago

Thanks! that let it connect the socket and streams but for some reason its not displaying the website and starting a download of an empty file...time for more debugging.

stevevls Over a year ago

@sko Glad to hear it! If my answer helped you, please consider accepting it...doing so helps motivate people to keep answering questions. :)

Ben Xu Over a year ago

more : don't use IP address. see java bug : bugs.openjdk.java.net/browse/JDK-8133196

Abdullah Ahçı · Accepted Answer · 2018-10-16 14:39:22Z

0

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

answered Oct 16, 2018 at 14:39

Abdullah Ahçı

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