Create, cleanup, duplicate

The first step when using this API is to create a CURLU * handle that holds URL info and resources. The handle is a reference to an associated data object that holds information about a single URL and all its different components.
The API allows you to set or get each URL component separately or as a full URL.
Create a URL handle like this:
CURLU *h = curl_url();
When you are done with it, clean it up:
When you need a copy of a handle, just duplicate it:
CURLU *nh = curl_url_dup(h);