authentication - Logoff does not restrict file access to users (Django) -

i have created django app , incorporated in 1 of app's page d3. example gets data file data.tsv stored in server. path data.tsv file path.

now in order prevent access http://localhost:8000/path users other registered , use django app have changed chmod privileges of others in root folder path can nor read nor execute or write.

my problem when user logged in decides logout tab using able access http://localhost:8000/path if cached in users browser. if example reset browser http://localhost:8000/path not accessible.

do have ideas on how can prevent this? thank much