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Get individual URL parts

The CURLU handle stores the individual parts of a URL and the application can extract those pieces individually from the handle at any time. If they are set.
The second argument to curl_url_get() specifies which part you want extracted. They are all extracted as null-terminated char * data, so you pass a pointer to such a variable.
char *host;
rc = curl_url_get(h, CURLUPART_HOST, &host, 0);
char *scheme;
rc = curl_url_get(h, CURLUPART_SCHEME, &scheme, 0);
char *user;
rc = curl_url_get(h, CURLUPART_USER, &user, 0);
char *password;
rc = curl_url_get(h, CURLUPART_PASSWORD, &password, 0);
char *port;
rc = curl_url_get(h, CURLUPART_PORT, &port, 0);
char *path;
rc = curl_url_get(h, CURLUPART_PATH, &path, 0);
char *query;
rc = curl_url_get(h, CURLUPART_QUERY, &query, 0);
char *fragment;
rc = curl_url_get(h, CURLUPART_FRAGMENT, &fragment, 0);
char *zoneid;
rc = curl_url_get(h, CURLUPART_ZONEID, &zoneid, 0);
Remember to free the returned string with curl_free when you are done with it!
Extracted parts are not URL decoded unless the user asks for it with the CURLU_URLDECODE flag.

URL parts

The different parts are named from their roles in the URL. Imagine a URL that looks like this:
http://joe:[email protected]:8080/images?id=5445#footer
When this URL is parsed by curl, it will store the different components like this:
text
part
http
CURLUPART_SCHEME
joe
CURLUPART_USER
7Hbz
CURLUPART_PASSWORD
example.com
CURLUPART_HOST
8080
CURLUPART_PORT
/images
CURLUPART_PATH
id=5445
CURLUPART_QUERY
footer
CURLUPART_FRAGMENT

Zone ID

The one thing that might stick out a little is the Zone id. It is an extra qualifier that can be used for IPv6 numerical addresses, and only for such addresses. It is used like this, where it is set to eth0:
http://[2a04:4e42:e00::347%25eth0]/
For this URL, curl extracts:
text
part
http
CURLUPART_SCHEME
2a04:4e42:e00::347
CURLUPART_HOST
eth0
CURLUPART_ZONEID
/
CURLUPART_PATH
... and asking for any other component will then return non-zero as they are missing.