Tests disabling cache from inspector.

http://127.0.0.1:8000/devtools/network/resources/resource.php?random=1&cached=1
http://127.0.0.1:8000/devtools/network/resources/resource.php?random=1&cached=1
http://127.0.0.1:8000/devtools/network/resources/resource.php?random=1&cached=1