Create Python https Website

The blog article shows you how to add self-signed certificate  to https web site.

The code uses Flask’s built-in SSL support to create an HTTPS server. Here’s how it works:

1. SSL Certificate Generation (generate_cert.py)

• Uses OpenSSL library to create a self-signed certificate
• Generates:
  • cert.pem – The SSL certificate file
  • key.pem – The private key file
• Certificate is valid for localhost development

#!/usr/bin/env python3

“””

Generate self-signed SSL certificate for local HTTPS development

“””

from OpenSSL import crypto

import os

def generate_self_signed_cert(cert_file=”cert.pem”, key_file=”key.pem”):

    # Create a key pair

    key = crypto.PKey()

    key.generate_key(crypto.TYPE_RSA, 2048)

    # Create a self-signed cert

    cert = crypto.X509()

    cert.get_subject().C = “US”

    cert.get_subject().ST = “State”

    cert.get_subject().L = “City”

    cert.get_subject().O = “Organization”

    cert.get_subject().OU = “Development”

    cert.get_subject().CN = “localhost”

    cert.set_serial_number(1000)

    cert.gmtime_adj_notBefore(0)

    cert.gmtime_adj_notAfter(365*24*60*60)  # Valid for 1 year

    cert.set_issuer(cert.get_subject())

    cert.set_pubkey(key)

    cert.sign(key, ‘sha256’)

    # Write certificate

    with open(cert_file, “wb”) as f:

        f.write(crypto.dump_certificate(crypto.FILETYPE_PEM, cert))

    # Write private key

    with open(key_file, “wb”) as f:

        f.write(crypto.dump_privatekey(crypto.FILETYPE_PEM, key))

    print(f”✓ Certificate generated: {cert_file}”)

    print(f”✓ Private key generated: {key_file}”)

    print(“\nYou can now run your Flask app with HTTPS support!”)

if __name__ == “__main__”:

    generate_self_signed_cert()

2. HTTPS Server Setup (app.py)

# Create SSL context for HTTPS

context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)

context.load_cert_chain(‘cert.pem’, ‘key.pem’)

app.run(debug=True, host=’0.0.0.0′, port=5000, ssl_context=context)

Also: Apache Run Python Flack

Source code download: https://github.com/chanmmn/python/tree/main/2025/flackhttps?WT.mc_id=DP-MVP-36769

Reference: https://flask.palletsprojects.com/en/stable/?WT.mc_id=DP-MVP-36769