Question

I want to know whether a user are actually looking my site(I know it’s just load by the browser and display to human, not actually human looking at it).

I know two method will work.

1. Javascript.

   If the page was load by the browser, it will run the js code automatically, except forbid by the browser. Then use AJAX to call back the server.

2. 1×1 transparent image of in the html.

   Use img to call back the server.

Do anyone know the pitfall of these method or any better method?

Also, I don’t know how to determine a 0×0 or 1×1 iframe to prevent the above method.

Answer 1

1. A bot can access a browser, e.g. http://browsershots.org

2. The bot can request that 1×1 image.

In short, there is no real way to tell. Best you could do is use a CAPTCHA, but then it degrades the experience for humans.

Just use a CAPTCHA where required (user sign up, etc).