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Level 8

Roku - Charles proxy issue

I am trying to setup Charles proxy in transparent mode. My app uses Charles root certificate and I share connection from my mac to connect Roku. However, on Charles tab, when app tries to make the first request, I can see:

Charles Error Report
Invalid first line in request
The actual exception reported was: 27com.xk72.proxy.http.HttpFieldsException: Invalid first line in request

The same setup, the same certificate works with mitmproxy tool (the requests pass successfully and I can see them). Has anyone solved a similar issue?