CODEWITHSUNDEEP
pythonsslflaskhttps
xanjay
xanjay

Reputation: 571

How to run localhost with HTTPS in flask?

I generated private key and self-signed certificate using:

openssl req -x509 -out localhost.crt -keyout localhost.key \
  -newkey rsa:2048 -nodes -sha256 \
  -subj '/CN=localhost' -extensions EXT -config <( \
   printf "[dn]\nCN=localhost\n[req]\ndistinguished_name = dn\n[EXT]\nsubjectAltName=DNS:localhost\nkeyUsage=digitalSignature\nextendedKeyUsage=serverAuth")

Created context as below:

from OpenSSL import SSL

context = SSL.Context(SSL.TLSv1_2_METHOD)
context.use_certificate('localhost.crt')
context.use_privatekey('localhost.key')

And ran flask app in two ways (none of them worked):

if __name__ == '__main__':
    app.run(ssl_context=('localhost.crt', 'localhost.key'), debug=True)

OR

if __name__ == '__main__':
    app.run(host='127.0.0.1', ssl_context=context, debug=True)

Finally,

python app.py

Yet, it doesn't run on https. How can I run as: https://localhost:5000 ?

Upvotes: 0

Views: 6928

Answers (1)

stasiekz
stasiekz

Reputation: 1853

The way you generate the certificate and the ssl_context setup is working.

I'm guessing you run the application with Flask command e.g. flask run but your ssl_context setup is inside if __name__ == '__main__': statement meaning it will be executed this way only if you execute this file directly e.g. python app.py assuming that the file is called app.py.

By default flask runs app on http hence it is missing https.

Upvotes: 1

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