In previous versions of 4th Dimension, the support for unknown URLs (URLs that correspond neither to an existing page nor to a 4D special URL) was a particular case: the values returned in $1 in the On Web Authentication and On Web Connection database methods did NOT begin with the “/” character.

For example, if the URL was “https://123.4.567.89/Customers/Add” and if there was no page “Add” in the “Customers” folder, the database methods were called with the value “Customers/Add” in $1.

Since this particular case could sometimes prove to be problematic, it has been removed in 4th Dimension 2004: all URLs sent in $1 start with the “/” character.