Java - using Socket with Proxy

Question

I am using sockets to connect to websites and APIs via HTTP (I know, this could be done easier with the URL class, but I had some reasons for choosing this way).

Now I want to implement a privacy feature, and so all the connections should be redirected through a proxy. But I am running into problems doing that.

I looked for and selected a free proxy, for testing purposes, from a Free Proxy List website. I chose one with a high uptime for my testing routines, but it hasn't worked out so far.

My source code:

URL url = new URL("someurl");
InetSocketAddress address = new InetSocketAddress("202.77.110.22", 8080); 
java.net.Proxy javaProxy = new Proxy(Proxy.Type.SOCKS, address);
Socket server = new Socket(javaProxy);
server.connect(new InetSocketAddress(url.getHost(), url.getPort()));

I want to connect to the URL via the proxy "202.77.110.22:8080". If I execute the code using Eclipse, I have to wait approximately five minutes and then receive the following error:

SocketException: Malformed reply from SOCKS server

When using Proxy.Type.HTTP instead of Proxy.Type.SOCKS, I receive the following error message:

IllegalArgumentException - Invalid Proxy

I know that (forms of) this question have already been asked on Stackoverflow, but none of the answers have helped me. Maybe I chose an unsupported proxy? It works while testing it using Apache HttpComponents.

All help appreciated.

execepthe last line which I changed to server.connect(new InetSocketAddress(url.getHost(), (url.getPort()==-1)?80:url.getPort())); Your code works in my machine — Omar MEBARKI
– Omar MEBARKI, Commented Mar 15, 2013 at 12:35
Have you checked that the proxy works by setting it in your browser? — beny23
– beny23, Commented Mar 15, 2013 at 12:39
The proxy works using Apache HttpComponents. @OmarMEBARKI I tried it, but I still got the same error - I have to wait 5 min and then receive a SocketException. My full code: paste.ubuntu.com/5616412 Can you post your full code and your output? — Martin Bories
– Martin Bories, Commented Mar 15, 2013 at 12:47
I am sorry, Actually it doesnot work. It cannot work because a socket needs only an IP adress. But an URL can have IP + file name ... — Omar MEBARKI
– Omar MEBARKI, Commented Mar 15, 2013 at 13:05
8080 will be an HTTP proxy, not a SOCKS proxy, as the first exception indicates. — user207421
– user207421, Commented Jul 15, 2015 at 3:53

Behzad · Accepted Answer · 2015-07-15 04:11:16Z

4

Prior to Java 8, raw TCP socket connectivity only works through SOCKS proxies - that's why you got IllegalArgumentException - Invalid Proxy. It was only in Java 8 that connection of raw sockets through HTTP proxies was added.

edited Jul 15, 2015 at 4:11

Behzad

3,5904 gold badges38 silver badges64 bronze badges

answered Jul 15, 2015 at 3:28

user5117688

562 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Kal · Accepted Answer · 2015-08-21 17:55:51Z

-1

I think you need to get rid of this line:

InetSocketAddress address = new InetSocketAddress("202.77.110.22", 8080);

And change this line:

java.net.Proxy javaProxy = new Proxy(Proxy.Type.SOCKS, address);

to:

java.net.Proxy javaProxy = new Proxy(Proxy.Type.SOCKS, "202.77.110.22:8080");

Because you can't specify a proxy as a "InetSocketAddress". Those are two different things.

answered Aug 21, 2015 at 17:55

Kal

4214 silver badges7 bronze badges

Collectives™ on Stack Overflow

Java - using Socket with Proxy

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related