Is there any standard that governs the content of responses from caIssuers URLs?
I notice that LE’s certs put in a URL (http://cert.int-x3.letsencrypt.org/) that returns a certificate; however, the that intermediate cert has a URL for a .p7c payload (from IdenTrust), not an X.509 cert.
I’ve looked at caIssuers returns from a couple other CAs, and they all have X.509.
Is IdenTrust just an outlier here? Are there other formats to look out for? And, especially, is there any standard that governs which formats can and can’t be sent as payloads to these URLs?