公众号开发：

客户端(真机)使用weixin-1.6.0.js调用uploadImage,上传图片，得到server_id,服务端拿server_id，下载临时素材，40007

https://api.weixin.qq.com/cgi-bin/media/get?access_token=80_AgiDu8FfwjwUlrNxeZINWWIFTnNsi-PdvmbN8fwhL8wGlLXhShKG1tSDQRHS3YBQ0BWjJ1NJxPmEqDyX_zQ7qQYoqObZFN5n8U9FMpn8IwY571lzQ3B9QlZ0FisEJVhADAAFR&media_id=_BTXhLWSPhsv2DmobJVfzohoglk2nSvV6DVslEJH1dY-7V-0Ag2SdC5i2MISE2NY

{"errcode":40007,"errmsg":"invalid media_id hint: [1g5MVA03523954] rid: 6644a778-578294a2-3b42b4ea"}