You are privileged to get such a verbose error..
Exception Type: DisallowedHost at / Exception Value: Invalid HTTP_HOST header: 'django-env.vsvztq2hxp.us-west-1.elasticbeanstalk.com'. You may need to add 'django-env.vsvztq2hxp.us-west-1.elasticbeanstalk.com' to ALLOWED_HOSTS.
Just add django-env.vsvztq2hxp.us-west-1.elasticbeanstalk.com to your ALLOWED_HOSTS in settings.py
Do something like this
#in settings.py
ALLOWED_HOSTS = [ 'django-env.vsvztq2hxp.us-west-1.elasticbeanstalk.com', ...]