各种类型文件的Content Type
CONTENT_TYPE = { '.load': 'text/html', '.123': 'application/vnd.lotus-1-2-3', '.3ds': 'p_w_picpath/x-3ds', '.3g2': 'video/3gpp', '.3ga': 'video/3gpp', '.3gp': 'video/3gpp', '.3gpp': 'video/3gpp', '.602': 'application/x-t602', '.669': 'audio/x-mod', '.7z': 'application/x-7z-compressed', '.a': 'application/x-archive', '.aac': 'audio/mp4', '.abw': 'application/x-abiword', '.abw.crashed': 'application/x-abiword', '.abw.gz': 'application/x-abiword', '.ac3': 'audio/ac3', '.ace': 'application/x-ace', '.adb': 'text/x-adasrc', '.ads': 'text/x-adasrc', '.afm': 'application/x-font-afm', '.ag': 'p_w