there are two subdomains under a top-level domain, as follows
a.abc.com has a https security certificate, but b.abc.com does not. Can these two subdomains share a https certificate
to allow two domain names to use the same certificate, you need to apply for a wildcard certificate (* .abc.com), which is very expensive
Yes, but b.abc.com will report that the certificate cannot be trusted. For a certificate to be trustworthy, three conditions need to be met:
www.example.com , but the address accessed by your browser is www1.example.com , and the browser will also play a warning) for the third case, if you want multiple domain names to share a certificate, the solution is to use a wildcard certificate (also known as a pan-domain name certificate). You can ask CA to sign a certificate similar to * .example.com (usually not cheap, but let's encrypt supports free, DNS authentication is required. Check the let's encrypt documentation for details), so that all domain names under this domain name are valid.
just buy a wildcard certificate.
Why do you want to do this, please?
there are so many free htts!
Yes, but to buy a wildcard certificate, it is estimated to be a bit expensive. You can apply for each domain name separately, and there is a free
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