<body>
The images below should load.<br>
<img src="http://127.0.0.1:8000/resources/square100.png?should_not_be_blocked_1"><br>
<img src="http://127.0.0.1:8000/resources/square100.png?should_not_be_blocked_2"><br>
The images below should be blocked.<br>
<img src="http://127.0.0.1:8000/resources/square100.png?should_be_blocked_1"><br>
<img src="http://127.0.0.1:8000/resources/square100.png?should_be_blocked_2"><br>
<img src="http://127.0.0.1:8000/resources/square100.png?should_be_blocked_3"><br>
</body>