diff --git a/src/lib/app.ts b/src/lib/app.ts
index fad34a65f2..a49f979296 100644
--- a/src/lib/app.ts
+++ b/src/lib/app.ts
@@ -201,6 +201,7 @@ export default async function getApp(
     }
 
     app.get(`${baseUriPath}`, (req, res) => {
+        res.set('Content-Type', 'text/html');
         res.send(indexHTML);
     });
 
@@ -214,6 +215,14 @@ export default async function getApp(
     });
 
     app.get(`${baseUriPath}/*`, (req, res) => {
+        res.set('Content-Type', 'text/html');
+        const requestPath = path.parse(req.url);
+        // appropriately return 404 requests for assets with an extension (js, css, etc)
+        if (requestPath.ext !== '' && requestPath.ext !== 'html') {
+            res.set('Cache-Control', 'no-cache');
+            res.status(404).send(indexHTML);
+            return;
+        }
         res.send(indexHTML);
     });