SSL for flask local development

Recently at HasGeek we moved all our web application to https. So I wanted to have all my development environment urls to have https.

How to have https in flask app

Method 1

from flask import Flask
app = Flask(__name__)'', debug=True, port=8100, ssl_context='adhoc')

In the above piece of code, ssl_context variable is passed to werkezug.run_simple which creates SSL certificates using OpenSSL, you may need to install pyopenssl. I had issues with this method, so I generated self signed certificate.

Method 2

  • Generate a private key openssl genrsa -des3 -out server.key 1024

  • Generate a CSR openssl req -new -key server.key -out server.csr

  • Remove Passphrase from key cp server.key openssl rsa -in -out server.key

  • Generate self signed certificate openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt


from flask import Flask
app = Flask(__name__)'', debug=True, port=8100, ssl_context=('/Users/kracekumarramaraju/certificates/server.crt', '/Users/kracekumarramaraju/certificates/server.key'))

ssl_context can take option adhoc or tuple of the form (cert_file, pkey_file).

In case you are using /etc/hosts, add something similar https://hacknight.local for accessing the web application locally.

Here is much detailed post about generating self signed certificates.

python  ssl  https  flask 

See also

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