It overwrites the built in functions to parse out the form parts, but it only works on *nix systems. This was a while ago and solved my problem. ymmv ;)
Thank you so much!! I realized that this wasn't new. However, I just now was wondering how to parse json with arc and then this post popped up. Plus a cs lesson included!
I had that problem a while ago, If I remember correctly, Android was sending "cookies:" and not "Cookies:" in the header.... so setting cookies via arc or js was great, reading them with js was also fine, but arc couldn't parse them from the header.