, have historically been vulnerable to HTTP request smuggling Mitigation To secure an environment showing this header: Switch to a Production Server

Feb 22, 2567 BE — |_http-title: Site doesn't have a title (text/plain; version=0.0. 4; charset=utf-8). |_http-server-header: WSGIServer/0.2 CPython/ Medium·Dpsypher nisdn/CVE-2021-40978 - GitHub

Replace development servers (like wsgiref or basic WSGIServer implementations) with production-grade WSGI servers like Gunicorn or Waitress .

Security professionals use tools like nmap or curl to identify these servers: nmap -sV -p 8000