You can use this to test your browser for CSP leaks, your web-mailer for HTTP leaks and everything else that is not supposed to send HTTP requests to where the sun won't shine. With "HTTP Leak", we are essentially referring to a situation, where a certain combination of HTML elements and attributes cause a request to an external resource to be fired - when it should not. Think, for example, of the


{{#tags}}- {{label}}
{{/tags}}