Please find the attached patch to fix the below security issues:
Host Header Injection - Added ALLOWED_HOSTS list to limit host address
Lack of Content Security Policy (CSP) - Added security header
Lack of Protection Mechanisms - HSTS - Added security header
Lack of Cookie Attribute – Secure : Kept as False as secure limits cookies to HTTPS traffic only.
Information Disclosure – Web Server / Development Framework VersionDescription: Kept as hard coded 'Python' instead of exposing wsgi/python/gunicorn version info.
Please review and let me know if I have missed anything.
I took a very quick look at this, and one thing that immediately stood out is that HSTS should definitely not be enabled by default. That can make dev/test/redeploy extremely difficult.