TypeError: Subscripted generics cannot be used with class and instance checks in models.py

[irt-shpc]

There is an error in Python > 3.11 where the HttpUrl annotated type construct cannot be used with isinstance. In order to keep the type as a plain str for most of the code and not a true pydanticHttpUrl we need a wrapper class

[irt-shpc]

Solved with PR #48