Finds the realm a path opens with, by its prefix or in the EST label position.
An undefined realm answers null, so the path falls through to express's 404.
the request path
{ realm, rest } (with form: 'est-label' for the EST form), or null
{ realm, rest }
form: 'est-label'
Finds the realm a path opens with, by its prefix or in the EST label position.
An undefined realm answers null, so the path falls through to express's 404.