Hi. I'm using my application on networks that have proxy, and others that do
not.
I'm trying to make a ProxySelector that will use the System proxy setting as
default (just pass the select request to the delegate), and if that fails,
showing a dialog to configure the proxy for this application instance and
retry.
I thought that it would be pretty easy just by creating a list on
ProxySelector.select that first has the delegate proxy settings and then
adding my lazy Proxy implementation that when requested the SocketAdress
would query the user (as a last resort).
The problem is that the returned connection for the delegate is DIRECT with
proxy = Proxy.NO_PROXY and that is handled specially in the SocksSocketImpl
class, and does NOT catch the thrown exceptions, unlike all the other
Proxies.
Any way i can fix this?
Alternativelly, any way i can probe for the proxy to change my strategy
from fail - query to test once at init - ask proxy if neeed - use proxy if
needed?
JDK code on protected void connect(SocketAddress endpoint, int timeout)
throws IOException of SocksSocketImpl follows.
iProxy = sel.select(uri).iterator();
if (iProxy == null || !(iProxy.hasNext())) {
super.connect(epoint, timeout);
return;
}
while (iProxy.hasNext()) {
p = iProxy.next();
if (p == null || p == Proxy.NO_PROXY) {
super.connect(epoint, timeout);
<-----------------------EXCEPTION HERE
return;
}
if (p.type() != Proxy.Type.SOCKS)
throw new SocketException("Unknown proxy type : " + p.type());
if (!(p.address() instanceof InetSocketAddress))
throw new SocketException("Unknow address type for proxy: " +
p);
// Use getHostString() to avoid reverse lookups
server = ((InetSocketAddress) p.address()).getHostString();
port = ((InetSocketAddress) p.address()).getPort();
// Connects to the SOCKS server
try {
privilegedConnect(server, port, timeout);
// Worked, let's get outta here
break;
} catch (IOException e) {
// Ooops, let's notify the ProxySelector
sel.connectFailed(uri,p.address(),e);
server = null;
port = -1;
savedExc = e;
// Will continue the while loop and try the next proxy
}
}
