<!DOCTYPE html>
<html>
  <header>
    <title>Welcome to H2O</title>
  </header>
  <body>
    <p>Welcome to H2O - an optimized HTTP server</p>
    <p>It works!</p>
  </body>
</html>

<!DOCTYPE html>
<html>
  <head>
    <title>Welcome to H2O</title>
  </head>
  <body>
    <p>Welcome to H2O - an optimized HTTP server</p>
    <p>It works!</p>
  </body>
</html>

Fix invalid HTML in sample page
Fix invalid HTML in sample page

- Change <header> tag to <head>