The fix for https://jira.ez.no/browse/EZP-26181 does not work when the url is e.g. example.com/ezwebin_site_admin without a trailing slash. It truncates the uri_part, breaking the interface. The code should not assume a trailing slash.

Reported in https://github.com/ezsystems/LegacyBridge/commit/d30373f67c3ee339aa64946e9533b275351d0746#commitcomment-19318934