How do you figure out what is causing '/login' to be called?

I was looking at the Firebug output for my index page and noticed that my /login handler is getting called at some point during the execution of the index page. It doesn't redirect to the /login page though for some reason.

But I can't tell which resou开发者_JAVA百科rce is triggering /login to be called. Is there some way of outputting the source of the call to the handler in Spring 3.0 MVC?

I would start by turning up the logging and checking out the log on the application\web server.