CURLE_COULDNT_RESOLVE_HOST from CURLU API on https://www.google.com

From: Samuel Marks via curl-library <curl-library_at_cool.haxx.se>
Date: Fri, 20 Aug 2021 15:39:25 +1000

I'm writing a tiny libcurl wrapper. I use curl_slist for headers, and
your CURLU (URL API) for urls.
https://github.com/SamuelMarks/curl-simple-https

In https://github.com/SamuelMarks/curl-simple-https/blob/90e16a9/libcurl_simple_https/curl_simple_https.c
the relevant lines that my `https_get` function get to are:

curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, urlp);
curl_easy_perform(curl);

Elsewhere, the urlp is set, e.g.,
https://github.com/SamuelMarks/curl-simple-https/blob/90e16a9/libcurl_simple_https/curl_simple_https/main.c

url = curl_url();
rc = curl_url_set(url, CURLUPART_URL, "https://google.com" /*args.url*/, 0);
struct ServerResponse response = https_get(url, NULL);
puts(response.body);
curl_url_cleanup(url);

Error-handling &etc. omitted in this mailing-list email for brevity.

AFAIK everything I'm doing is correct, as per the documentation.
However when I run the code on macOS (AppleClang, brew curl) or
Windows (MSVC, vcpkg curl) I get something like:
* IDN support not present, can't parse Unicode domains
* Could not resolve host: �
* Closing connection 0
curl operation failed: Couldn't resolve host name
����

I've tried `curl_url_get(urlp, CURLUPART_HOST, &host, 0)`, and
printing out `host` just before `curl_easy_perform` is called, but it
all looks fine at that juncture.

What am I doing wrong?

Thanks,

Samuel

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Received on 2021-08-20