diff --git a/index.js b/index.js
index b307d27f..0450591f 100644
--- a/index.js
+++ b/index.js
@@ -2,9 +2,10 @@
 const http = require('http');
 const server = http.createServer((req, res) => {
   res.writeHead(200, {
-    'Content-Type': 'text/plain; charset=utf-8'
+    'Content-Type': 'text/html; charset=utf-8'
   });
-  res.write(req.headers['user-agent']);
+  //res.write('&lt;!DOCTYPE html&gt;&lt;html lang="ja"&gt;&lt;body&gt;&lt;h1&gt;HTMLの一番大きい見出しを表示します&lt/h1&gt;&lt;/body&gt;&lt;/html&gt;');
+  res.write('<!DOCTYPE html><html lang="ja"><body><h1>HTMLの一番大きい見出しを表示します<h1></body></html>');
   res.end();
 });
 const port = 8000;
