Google Trust Services: OCSP responses not published in a timely manner

Google Trust Services identified an issue with their OCSP responders where the `max-age` directive in the `Cache-Control` HTTP response header was set too high, potentially delaying the publication of updated OCSP responses. Following a thorough investigation, they implemented a series of changes to reduce the `max-age` value from 24 hours to 4 hours, significantly improving the timeliness of OCSP status updates. The issue did not result in certificate misissuance but may have caused delays in revocation status publication. The case has been resolved with the implementation of these changes.

1. 2018-06-07 Set max-age directive to 24 hours in legacy OCSP software.
2. 2022-05-11 Updated max-age directive to 6 hours.
3. 2022-06-24 Reduced max-age directive to 4 hours and completed evaluation of OCSP responders.