Add an HTML example.

Config/ReverseProxy/config/html/html.example.com/index.html

@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<header>
+	<title>Example HTML Website</title>
+</header>
+<body>
+	<h1>Welcome to the example HTML website!</h1>
+	<p>This means the reverse proxy is successfully serving static HTML content. Yay!</p>
+</body>