Django: API call issue while running on gunicorn

Question

I use Rchilli resume parser for parsing resume. It works fine while running on python manage.py runserver . I am getting an xml data as api response. But while running on gunicorn I'm getting an html response saying that "The service is temporarily unavailable". Is there something need to be changed on the configuration of gunicorn to get this fixed?

As the project is still under development, I'm using only gunicorn for deploying the application. I am using this Method:Lessons Learned From The Dash: Easy Django Deployment for deploying the application without nginx.