[Python] Flask session don't persist data

I have a Javascript application and a Flask application. When the user send data from Js to Flask, I store it on session and it works fine at a specific route:

@app.route(...)
def user(...):
session['name'] = name

print(session['name']) # Works !


But when I tr to get the values on session from another method / route the session is empty:

@app.route(...)
def current():
print(session.keys(), session.values) # Empty !


I have installed Flask Session and set the config to:

'SECRET_KEY': b'...',

'SESSION_TYPE': 'filesystem', # Memcache, null and redis

'SESSION_PERMANENT': False, # True


And then started the Flask application and it not work. I have also try to set session.modified = True after I add some new value to session and still not work.

I have read lots of threads on Stack Over Flow, Reddit, etc; and nothing worked. Tips please ?

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