Contains relative or absolute URL that can be used to check the revocation status of a certificate.
According to documentation:
«It is a relative or absolute URL that can be used to check the revocation status of a certificate. The revocation check will be performed as an HTTP GET method using a url that is the concatenation of revocation-url and certificate-serial-number. Where the certificate-serial-number is encoded as a string of ascii hexadecimal digits. For example, if the netscape-base-url is https://www.certs-r-us.com/, the netscape-revocation-url is cgi-bin/check-rev.cgi?, and the certificate serial number is 173420, the resulting URL would be: https://www.certs-r-us.com/cgi-bin/check-rev.cgi?02a56c The server should return a document with a Content-Type of application/x-netscape-revocation. The document should contain a single ascii digit, '1' if the certificate is not curently valid, and '0' if it is curently valid.»