wechat access token: error 40066

Accordingly to docs, all I have to do after creating dev account, is following:

GET https://api.weixin.qq.com/cgi-bin/token/?grant_type=client_credential&appid=MY_ID&secret=MY_SECRET

But, I get this:

{
  "errcode": 40066,
  "errmsg": "invalid url hint: [qQ0550418k466!]"
}

Tried both "api.weixin.qq.com" and "api.wechat.com" domains, no difference. This error code is not even described in docs. Does anybody know what to do with this?

Solution

Ok, it appears that there should not be slash before "?". That's all.