https://github.com/openstreetmap/operations/issues/837
SSLStaplingCache shmcb:${APACHE_RUN_DIR}/ssl_ocspcache(512000)
Header always set Strict-Transport-Security "<%= node[:ssl][:strict_transport_security] %>" "expr=%{HTTPS} == 'on'"
-<% if node[:ssl][:ct_report_uri] -%>
-Header always set Expect-CT "max-age=0, report-uri=\"<%= node[:ssl][:ct_report_uri] %>\"" "expr=%{HTTPS} == 'on'"
-<% else -%>
-Header always set Expect-CT "max-age=0" "expr=%{HTTPS} == 'on'"
-<% end -%>