SiteFilter now matches request paths against configurable patterns to derive the requested site. This is much more efficient than the previous strategy which simply checked every path segment if it matched one of the segments of the known site root navigations. The new strategy is to take a list of patterns to check if the current request URI paths contains a site segment, then check the first path segment after the dispatcher servlet segment if it is site segment but exclude a list of known prefixes. The list of path patterns that have a site segment in it is configured via cae.site.patterns and the list of known non-site path prefixes is configured via cae.site.ignore-prefix-patterns. The former SiteFilter behavior can be restored by setting both properties to empty values. Configure cae.site.collect-non-matching-paths=true to collect non matching paths to support debugging your SiteFilter config. This setting is enabled in the dev profile for your convenience.

(CMS-23583)