Error with https://docs.javawebstack.org/framework/httpserver

exception = HTTPSConnectionPool(host='docs.javawebstack.org', port=443): Max retries exceeded with url: /framework/httpserver (Caused by SSLError(SSLCertVerificationError(1, "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'docs.javawebstack.org'. (_ssl.c:992)")))