I am running Django, FastCGI, and Nginx. I am creating an api of sorts that where someone can send some data via XML which I will process and then return some status codes
If you use unicorn.
Look at top on your server. Unicorn likely is using 100% of CPU right now. There are several reasons of this problem.
top
You should check your HTTP requests, some of their can be very hard.
Check unicorn's version. May be you've updated it recently, and something was broken.