Facebook let you use localhost as the canvas page; no idea if they also let you local network addresses as well. So that's one problem solved :)
For debugging calls such as those received by PayPal, I start by writing a small script that logs the GET or POST request, then write a simple test page that POSTS to the local script that I'm developing.
At any rate, if the only way to test the majority of your code is via a POST, there's something wrong with the way you're writing code; the objects you've created you should be able to test independently, for a start :)
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Facebook let you use localhost as the canvas page; no idea if they also let you local network addresses as well. So that's one problem solved :)
For debugging calls such as those received by PayPal, I start by writing a small script that logs the GET or POST request, then write a simple test page that POSTS to the local script that I'm developing.
At any rate, if the only way to test the majority of your code is via a POST, there's something wrong with the way you're writing code; the objects you've created you should be able to test independently, for a start :)