There's no possibility to add query params to JHttpQuery with the same key

[anton-antonenko]

There's no possibility to add query params to JHttpQuery with the same key, e.g.:
I have a query with params ?param1=value1&param1=value2&param1=value3.
Since we use a Map for query params there's no possibility to create such query.

[dlatnikov]

if such case is valid, we can easily fix this issue