Avoiding Mixed Content Errors with an HTTPS Python Server

This guide explains how to set up an HTTPS Python server (using Certbot/Let’s Encrypt or a self-signed OpenSSL certificate) to host JavaScript payloads and avoid browser mixed-content blocking when testing stored XSS; it provides step-by-step certificate creation (easy and manual Certbot flows), server.py examples, hosting steps, and brief XSS remediation guidance (CSP and input encoding).