Add support for OCSP stapling, https://tools.ietf.org/html/rfc6066
Supported was added to NSS in 3.15: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.15_release_notes
It looks like at the moment, NSS 3.19, NSS only really supports client-side stapling. There is minimal server-side code just for providing client testing.
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