fix: add Content-Type header for static files

src/lib/Server.js

@@ -310,16 +310,11 @@ module.exports = class Server {
               return;
             }
 
-            if (id.endsWith('.html'))
-              setHeader(event, 'Content-Type', 'text/html');
-            if (id.endsWith('.js'))
-              setHeader(event, 'Content-Type', 'application/javascript');
-            if (id.endsWith('.json'))
-              setHeader(event, 'Content-Type', 'application/json');
-            if (id.endsWith('.css'))
-              setHeader(event, 'Content-Type', 'text/css');
-            if (id.endsWith('.png'))
-              setHeader(event, 'Content-Type', 'image/png');
+            if (id.endsWith('.html')) setHeader(event, 'Content-Type', 'text/html');
+            if (id.endsWith('.js')) setHeader(event, 'Content-Type', 'application/javascript');
+            if (id.endsWith('.json')) setHeader(event, 'Content-Type', 'application/json');
+            if (id.endsWith('.css')) setHeader(event, 'Content-Type', 'text/css');
+            if (id.endsWith('.png')) setHeader(event, 'Content-Type', 'image/png');
 
             return {
               size: stats.size,