URL Forwarding or CNAME for github pages [closed]

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I've set up a github page with a custom subdomain like sub.abc.com, and I also want the domain abc.com redirects to the subdomain(show subdomain in the browser's address bar). So, which method should I take, 302 URL Forwarding or CNAME? Thanks.

Answer 1

I have got an answer form github's technical support staff via email, and he said that I should use URL Forwarding rather than CNAME. Hope this can be helpful for others who meet the same problem.