I am trying to call the below API using the flutter package `http`,
The structure of the request is 

```
GET /api/v3/4870020/products/123123?lang=en&token=123456789abcd HTTP/1.1
Host: app.ecwid.com
Content-Type: application/json;charset=utf-8
Cache-Control: no-cache

```

How can I call this API using http package.