Direct connection to Internet without Proxy

Is it possible to make a Direct connection to the Internet without using a Proxy.

Consider a case that my Organization has a Proxy and I use the DIRECT option given in the Java Proxy class.

SocketAddress addr = new
InetSocketAddress("webcache.mydomain.com", 8080);
Proxy proxy = new Proxy(Proxy.Type.DIRECT, addr);

If you go by the documentation it st开发者_运维知识库ates DIRECT which represents a direct connection, or absence of proxy.

Which is exactly the way it behaves. When I use this option, I dont have to give any Proxy details and I can access the content from the Internet.

I have three questions

1. As per my understanding if an Organization has a Proxy, all network traffic should get routed through the Proxy. No one should be able to access the Network directly ?
2. I also noted that if I remove the Proxy details from IE, I can not access the Web :-( How can Java still do it ?
3. If in any Organization you can access both with the Proxy and Directly, how does the firewall block certain sites ? How does the firewall even work ?

Thanks in advance.

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Proxy proxy = new Proxy(Proxy.Type.DIRECT, addr);

Is not the proper way to create a direct (no proxy) proxy directive. You should do

Proxy proxy = Proxy.NO_PROXY

The internal implementation of the Socket class and the HttpURLConnection checks if proxy == Proxy.NO_PROXY (note: "==", not "equals()"!).

It does NOT check if proxy.getType() == Proxy.Type.DIRECT.

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2) You might have set the proxy in any system properties. If you are using any IDE, check the proxy setting of the IDE.

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Not all Network traffic goes through a Proxy, if your Organization has a Proxy. You can still go ahead and establish a Direct connection to the Internet. Mostly the Organizations will block Direct connections and force you to use Proxies. Some times they might allow you to have a Restricted Direct connection, which allows certain URL's and denies other ones.