Note that you still have to whitelist the external domain for CSP if this is a new install of Discourse, as CSP is mandatory on all new installs. CSP will be mandatory on all installs once 2.3 is released as well.
Note that you still have to whitelist the external domain for CSP if this is a new install of Discourse, as CSP is mandatory on all new installs. CSP will be mandatory on all installs once 2.3 is released as well.