Getting list of blocked websites in proxy server

I want to have a diagnostic to ensure that my application will not be blocked to access the remote server because of the proxy setting. Is there a way to get the list of a blocked websites in proxy server from the client (.NET)? I suppose I could use WebRequest and try to call simple echo method in the server and whether I get a 403 or not but wondering if there is other way to do that.

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Thanks.

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This fully depends on your proxy. There is no standard way to achieve this, but your proxy may implement an interface that allows you to retrieve such information through a management API.