How to avoid error 404 on refresh with angular app on IIS that contains special characters...

I have an Angular App (V17), hosted on IIS. I have a route https://mysite/myapp/b%2fBP1SQsgyE%3D I can reach it the first time but I can't refresh. The server respond with 404. The issue comes from the special character %2f that is interpreted as a /, so instead of reaching "myapp" with the encrypted param, it tries to go to "myapp/b/2Bp......".

How can I have an URL with encoded characters so ?

I already have the redirection web.config, so I can refresh if there is no encoded character like "%2". I don't want to use param with "?param=". I want to keep route logic.

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