system proxy is used by deafult

app/src/processing/app/Preferences.java

@@ -140,7 +140,9 @@ public class Preferences {
 
     PApplet.useNativeSelect =
       Preferences.getBoolean("chooser.files.native"); //$NON-NLS-1$
-
+    
+    System.setProperty("java.net.useSystemProxies","true");
+    
     // Set http proxy for folks that require it.
     // http://docs.oracle.com/javase/6/docs/technotes/guides/net/proxies.html
     String proxyHost = get("proxy.host");