This repo has been successfully added a GitHub Page. On local or when no custom domain is added (i.e. be visited at https://username.github.io/repo-name/) it works fine, indicating that the code has no bug. However, when I add an internationalized domain name (kiếmtiền.quảcầu.cc – xn--kimtin-xi8bta.xn--qucu-hr5aza.cc), it redirects too many times. The content that Facebook Debugger can read is:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>301 Moved Permanently</title>
</head>
<body>
<center><h1>301 Moved Permanently</h1></center>
<hr>
<center>nginx</center>
</body>
</html>
When I use the domain with a test repo it works fine, indicating the setup on Cloudflare is also fine:
When I try turning off the proxy, on Firefox I get SSL_ERROR_BAD_CERT_DOMAIN, and on Edge I get NET::ERR_CERT_COMMON_NAME_INVALID.
I don’t know how to investigate any further. Do you have any idea?