{{% def id="OCSP" name="Online Certificate Status Protocol" abbr="OCSP" abbr_first="1" %}} A method to check the [revocation](#def-revocation) status of a [certificate](#def-leaf). In other words, a way to check whether a [Certificate Authority](#def-CA) indicates that the certificate should no longer be considered valid, even though its expiration date has not yet been reached. This request can create privacy problems because it allows the certificate authority, and Internet service providers, to directly observe who is visiting which sites. [Let's Encrypt](#def-LE) no longer provides an OCSP service. [Wikipedia](https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol) {{% /def %}}
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