As a convenience to applications, they can pass in an already parsed URL to
libcurl to work with, as an alternative to CURLOPT_URL.
You pass in a CURLU handle instead of a URL string with the CURLOPT_CURLU
option.
Example:
CURLU *h = curl_url();
rc = curl_url_set(h, CURLUPART_URL, "https://example.com/", 0);
CURL *easy = curl_easy_init();
curl_easy_setopt(easy, CURLOPT_CURLU, h);