chat server is going to be in its own dir

examples/chat_server/web_root/login.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" dir="ltr"> 
+  <!-- This file is part of the  Mongoose project,
+    http://code.google.com/p/mongoose -->
+  <head>
+    <title>Mongoose chat: login</title>
+    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
+    <!--
+      Note that this page is self-sufficient, it does not load any other
+      CSS or Javascript file. This is done so because only this page is
+      allowed for non-authorized users. If we want to load other files
+      from the frontend, we need to change backend code to allow those
+      for non-authorized users. See chat.c :: must_authorize() function.
+    -->
+  </head>
+
+  <script>
+    window.onload = function() {
+      // Set correct action for the login form. We assume that the SSL port
+      // is the next one to insecure one.
+      var httpsPort = location.protocol.match(/https/) ? location.port :
+        parseInt(location.port) + 1;
+      document.forms[0].action = 'https://' + location.hostname + ':' +
+        httpsPort + '/authorize';
+    };
+  </script>
+
+  <body>
+    <center>
+      <h2>Mongoose chat server login</h2>
+      <div style="max-width: 30em;">
+        Username and password can be any non-empty strings.
+      </div>
+      <br/>
+      <form>
+        <input type="text" name="user"></input><br/>
+        <input type="text" name="password"></input><br/>
+        <input type="submit" value="Login"></input>
+      </form>
+    </center>
+  </body>
+</html>