Context:
In order to allow external systems like SSO-Proxies to distinguish between public accessible Optimize links and those that require authentication a special sub-path "external" needs to be setup on the Optimize Webserver that internally rewrites these requests to the root of the webserver.

AT:

• Any request prefixed with this path "/external" get rewritten to "/"
  "/external/api" => "/api"
  "/external/static/js/2.cc466bae.chunk.js" => "/static/js/2.cc466bae.chunk.js"
  etc.