fix proxying bug

lib/vhost-sni-server.js

@@ -324,6 +324,13 @@ module.exports.create = function (securePort, certsPath, vhostsdir) {
     function addSniWorkaroundCallback() {
       //SNICallback is passed the domain name, see NodeJS docs on TLS
       secureOpts.SNICallback = function (domainname, cb) {
+        if (/(^|\.)_proxyable\./.test(domainname)) {
+          // device-id-12345678._proxyable.myapp.mydomain.com => myapp.mydomain.com
+          // _proxyable.myapp.mydomain.com => myapp.mydomain.com
+          // TODO myapp.mydomain.com.proxyable.com => myapp.mydomain.com
+          domainname = domainname.replace(/.*\.?_proxyable\./, '');
+        }
+
         if (!secureContexts.dummy) {
           console.log('[log] Loading dummy certs');
           secureContexts.dummy = createSecureContext(localDummyCerts);