if I go to play.google.com, it automatically recognizes my country and allow me to browse the apps for that country. I can change the language through the dropdown in the footer, or I can add &hl=code in the querystring...but that only changes the language...not the store content (the app lists and rankings remain the same)

I guess there must be some other querystring parameter or header parameter, because I'm sure Google devs don't use country-specific proxies or PCs located in locations in 50+ countries to see how the store appears there.

Any clue how this can be done?