As I commented in git log:

Both data.btcchina.com and api.btcchina.com are accessible, but if you use any private API (get account information or trade) with data.btcchina.com, it returns JSON with a PHP warning (WTF). api.btcchina.com is free from this problem and it is officially defined in http://btcchina.org/api-trade-documentation-en