Set explicitly values to AllowNull

[JacekWalczak92]

Right now, some of the objects from the response body are set with the value DisallowNull, however, they can be null, I think this happens because all optional values are by default transform to Required = [..].Disallownull -> is there any way to change this behaviour via UI before generating a service script for certain values or for all such stuff?

[C1yde]

Try to call this extension method in your ConfigureServices for correct swagger generation. There will be a lot of new generated stuff but it's ok.