Python Flask API in HTTPS

Before starting a server with SSL, you need to create private key and a certificate. I will create a self signed certificate for this tutorial.
Below commands will ask for information regarding your certirficate. Among them, ‘common name’ is the most important inforamtion. It should be the domain name of your server running. This will output two files,

1) udara.com.key –> private key for my domain
2) udara.com.ct –>Self signed certificate

openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout udara.com.key -out udara.com.crt

Below is the Flask code snippet to start your Flask API in HTTPS

from flask import Flask
from OpenSSL import SSL

import os

context = SSL.Context(SSL.SSLv23_METHOD)
cer = os.path.join(os.path.dirname(__file__), 'resources/udara.com.crt')
key = os.path.join(os.path.dirname(__file__), 'resources/udara.com.key')

app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello World!'

if __name__ == '__main__':
    context = (cer, key)
    app.run( host='0.0.0.0', port=5000, debug = True, ssl_context=context)

When you run above code, it will show below output. Note that it is running HTTPS

* Running on https://0.0.0.0:5000/ (Press CTRL+C to quit)
* Restarting with stat