func streamMongoCursorAsJSONResponse(w http.ResponseWriter, cur mongo.Cursor) {
    w.Header().Set("Content-Type", "application/json")
    w.Write([]byte("["))
    count := 0
    for cur.Next(context.Background()) {
        elem := bson.NewDocument()
        err := cur.Decode(elem)
        if err != nil {
            continue
        }
        if count != 0 {
            w.Write([]byte(",\n"))
        }
        w.Write([]byte(elem.ToExtJSON(false)))
        count++
    }
    w.Write([]byte("]"))
}