digininja , Thanks for your answer. I found that debian version may be 3 or 4 or around them . Can I know all possible contents of /etc/debian_version of debian 3 and 4 .
I have JWT token and I want to modify the key id field. Kid field can be used for local files. I had verfied that /etc/passwd can be used but I don't know the content. So I want to know some files that I can predict the content. The target website have 127.0.0.1/__sinatra__/404.png which I can download that png file. But I don't know the absolute path for that file. Does anyone know the solution of my problem.? Please help me.