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Tunnel

HttpServer can support the CONNECT method for establishing tunnels, which is most often used for HTTPS tunneling.

The CONNECT method is not enabled by default; the application needs to add it to supportedMethods first

    server.conf().supportedMethods("CONNECT", "GET", "HEAD" ... );

In the HttpHandler, the application needs to examine each CONNECT request and decide whether to allow the tunneling, based on criteria like client IP, target host:port. The target host:port is specified by request.host().

To grant the tunneling request, return a response with a 2xx status code; the server will then establish a tunnel between the client and the target. To deny the tunneling request, return a response with a status code that's not 2xx.

    HttpHandler handler = request->
    {
        if(request.method().equals("CONNECT")) // a tunneling request
        {
            if(isAllowed(request))
                return HttpResponse.text(200, "tunneling request granted");
            else
                return HttpResponse.text(403, "tunneling request denied");
        }

        ...

    };
    HttpServer server = new HttpServer(handler);

See also _HttpProxy.java for a simple HTTP+HTTPS proxy demo.

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