Support proxy app

src/reverseproxy.js

@@ -501,11 +501,18 @@ async function writeAppNginxConfig(app, fqdn, type, bundle) {
         cspQuoted: null,
         hideHeaders: [],
         proxyAuth: { enabled: false },
+        upstreamUri: '', // only for endpoint === external
         ocsp: await isOcspEnabled(bundle.certFilePath)
     };
 
     if (type === apps.LOCATION_TYPE_PRIMARY || type === apps.LOCATION_TYPE_ALIAS || type === apps.LOCATION_TYPE_SECONDARY) {
         data.endpoint = 'app';
+
+        if (app.manifest.id === constants.RELAY_APPSTORE_ID) {
+            data.endpoint = 'external';
+            data.upstreamUri = 'http://example.com';
+        }
+
         // maybe these should become per domain at some point
         const reverseProxyConfig = app.reverseProxyConfig || {}; // some of our code uses fake app objects
         if (reverseProxyConfig.robotsTxt) data.robotsTxtQuoted = JSON.stringify(app.reverseProxyConfig.robotsTxt);