I am developing a python app flask which is called by an another app via URL : https://host name:port/arg1=mdp &arg2=user -->hostname is my iis web server where i deployed the app. I would like to have a log per user --> when the user run the app it should normally create his own log and write in it, but unfortunately the mainthread write in all the logs of all users . I have tried : lock thread, multilogging, semaphore, socketio, calling with start-newthread -->No success Thanks for help