I have a Flask application with sessions that works well on my local development machine. However, when I try to deploy it on an Amazon server, sessions do not seem to work.
More specifically, the session cookie is not set. I can, however, set normal cookies. I made sure I have a static secure key, as others have indicated that might be an issue. The only difference is in how the server is set up. During development, I use
app.run()
to run locally. When deployed, I use
app.config['SERVER_NAME'] = '12.34.56.78' # <-- insert a "real" IP
app.run(host='0.0.0.0', port=80)
I suspect the problem might be in the above, but am not completely certain.
The session does seem to work on Firefox, but not Chrome.
The following small application demonstrates the problem, with the configuration differences at the bottom:
from flask import Flask, make_response, request, session
app = Flask(__name__)
app.secret_key = 'secretKey'
# this is to verify that cookies can be set
@app.route('/setcookie')
def set_cookie():
response = make_response('Cookie set')
response.set_cookie('cookie name', 'cookie value')
return response
@app.route('/getcookie')
def get_cookie():
if 'cookie name' in request.cookies:
return 'Cookie found. Its value is %s.' % request.cookies['cookie name']
else:
return 'Cookie not found'
# this is to check if sessions work
@app.route('/setsession')
def set_session():
session['session name'] = 'session value'
return 'Session set'
@app.route('/getsession')
def get_session():
if 'session name' in session:
return 'Session value is %s.' % session['session name']
else:
return 'Session value not found'
if __name__ == '__main__':
app.debug = True
# windows, local development
#app.run()
# Ubuntu
app.config['SERVER_NAME'] = '12.34.56.78' # <-- insert a "real" IP
app.run(host='0.0.0.0', port=80)
