title: What does ssl_verify_depth mean in nginx.conf?
body: <p>I am wondering what does ssl_verify_depth mean in nginx.conf? The <a href="https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_verify_client" rel="nofollow noreferrer">docs</a> are not very detailed, there is just this sentece:</p>
  <blockquote>
  <p>Sets the verification depth in the client certificates chain.</p>
  </blockquote>
  <p>What does increasing or decreasing do? I've noticed that increasing it makes nginx more likely to accept the cert, but why is that?</p>