Slush middle-tier auth fails against 9.0-6.2+

[grtjn]

Here a workaround:

+++ b/node-server/proxy.js
@@ -57,6 +57,11 @@ function proxy(req, res) {
 
     // TODO: filter www-header in response?
     // (currently prompts without authed middleware)
+    delete req.headers['x-forwarded-for'];
+    delete req.headers['x-forwarded-host'];
+    delete req.headers['x-forwarded-port'];
+    delete req.headers['x-forwarded-proto'];
+    delete req.headers['x-forwarded-server'];
 
     proxyServer.web(req, res, headers, function(e) {
       console.log(e);
diff --git a/node-server/routes.js b/node-server/routes.js
index c468f1b..e90643e 100644
--- a/node-server/routes.js
+++ b/node-server/routes.js
@@ -56,6 +56,13 @@ router.get('/user/status', function(req, res) {
     };
 
     delete headers['content-length'];
+
+    // get rid of some headers that throw off ML authentication
+    delete headers['x-forwarded-for'];
+    delete headers['x-forwarded-host'];
+    delete headers['x-forwarded-port'];
+    delete headers['x-forwarded-proto'];
+
     authHelper.getAuthorization(req.session, reqOptions.method, reqOptions.path, {
       authHost: reqOptions.hostname || options.mlHost,
       authPort: reqOptions.port || options.mlHttpPort,
diff --git a/node-server/utils/auth-helper.js b/node-server/utils/auth-helper.js
index 7ca2184..9d58c19 100644
--- a/node-server/utils/auth-helper.js
+++ b/node-server/utils/auth-helper.js
@@ -210,6 +210,15 @@ function getAuthorization(session, reqMethod, reqPath, authOptions) {
   var authorization = null;
   var d = q.defer();
   var mergedOptions = _.extend({}, defaultOptions, authOptions || {});
+
+  // get rid of some headers that throw off ML authentication
+  if (mergedOptions.headers) {
+    delete mergedOptions.headers['x-forwarded-for'];
+    delete mergedOptions.headers['x-forwarded-host'];
+    delete mergedOptions.headers['x-forwarded-port'];
+    delete mergedOptions.headers['x-forwarded-proto'];
+  }