Debugging PHP HTTP request not working

Hey there.

I use MAMP under OS X, I have a following problem:
debugging  PHP Web Application works ok, but PHP HTTP request doesn't work. After I click debug icon, no brekapoints are caught, it just outputs me results of particular request handler to console window. So it works absolutely as if would press "Run selected configuration".
Are there any ideas how to make breakpoints work? Status bar displays message "Process finished with exit code 0"

Thank you.