I think there may be a more fundamental issue here. You mention using the FastCgiModule, but according to How to use Django with FastCGI, SCGI, or AJP, it says:
Deprecated since version 1.7:
FastCGI support is deprecated and will be removed in Django 1.9.
This invalidates most blog posts and docs written before 2016. Anything dated 2015 or earlier is obsolete as far as Django is concerned with reference to IIS.
What you probably need to find is some documentation that specifically covers running IIS with WSGI (or ASGI) rather than FastCgi.
I did find a Python project, wfastcgi, that might serve as an appropriate bridge between the two protocols.