[ssl] How to do a https request with bad certificate?

Generally, The DNS Domain of the URL MUST match the Certificate Subject of the certificate.

In former times this could be either by setting the domain as cn of the certificate or by having the domain set as a Subject Alternative Name.

Support for cn was deprecated for a long time (since 2000 in RFC 2818) and Chrome browser will not even look at the cn anymore so today you need to have the DNS Domain of the URL as a Subject Alternative Name.

RFC 6125 which forbids checking the cn if SAN for DNS Domain is present, but not if SAN for IP Address is present. RFC 6125 also repeats that cn is deprecated which was already said in RFC 2818. And the Certification Authority Browser Forum to be present which in combination with RFC 6125 essentially means that cn will never be checked for DNS Domain name.

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