curl has made the following settings (this is the solution found, but it doesn"t work for me):

curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYSTATUS, false);

error prompt:

error:14082174:SSL routines:ssl3_check_cert_and_algorithm:dh key too small

in the course of looking up the data, I have learned that this is not a problem with libcurl. It seems that the client (libcurl) is unwilling to communicate with the server because the length of the password set by the server is too short. When
Chrome visits this page, a red "warning" does appear.

the information I can find when I use libcurl, on cPP is about php or non-libcurl.
they asked me to set cipher list to "default rel= filling DH" ( https://github.com/scrapy/scr.
libcurl has a very similar setting CURLOPT_SSL_CIPHER_LIST . ( https://curl.haxx.se/libcurl/.
but my setting doesn"t work, and this string doesn"t look like the format used by libcurl.
they also asked me to set CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST to false.
is like the code posted at the beginning, which I already did, but it didn"t work.