If multiple x-forwarded-proto use first

See - tornadoweb/tornado#2162 - jupyterhub/zero-to-jupyterhub-k8s#1700 (comment)
manics · Oct 15, 2020 · cde6854 · cde6854
1 parent 3db533f
commit cde6854
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/lib/configproxy.js b/lib/configproxy.js
@@ -510,6 +510,12 @@ class ConfigurableProxy extends EventEmitter {
         return;
       }
 
+      // X-Forwarded-Proto may have multiple values, Tornado uses the last but we want the first
+      if (req.headers['x-forwarded-proto']) {
+        req.headers['x-forwarded-proto'] = req.headers['x-forwarded-proto'].split(',')[0];
+        that.log.debug('Using first x-forwarded-proto: ' + req.headers['x-forwarded-proto'])
+      }
+
       if (kind === "web") {
         that.emit("proxyRequest", req, res);
       }