EC2 Django App Only Accessible without www. prefix - django

Question

if I visit:
myapp.com (it works)
if I visit:
www.myapp.com (throws http 500 error)
or
the fully-qualified version: http://www.myapp.com (throws http 500 error)
that http 500 error is:
xx.xx.xxx.xxx - - [26/Oct/2013:18:33:10 +0000] "GET / HTTP/1.1" 500 460 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:24.0) Gecko/20100101 Firefox/24.0"
I am getting this error, from my access.log used as part of my nginx configuration (note error.log has nothing new in it):
server {
#listen 8001;
listen 80;
#listen 127.0.0.1;
server_name myapp.com www.myapp.com; #*.myapp.com;
#server_name ec2-xx-xxx-xxx-xx.compute-1.amazonaws.com;
access_log /home/ubuntu/virtualenv/myapp/error/access.log;
error_log /home/ubuntu/virtualenv/myapp/error/error.log warn;
connection_pool_size 2048;
fastcgi_buffer_size 4K;
fastcgi_buffers 64 4k;
root /home/ubuntu/virtualenv/myapp/homelaunch/;
location /static/ {
alias /home/ubuntu/virtualenv/myapp/homelaunch/static/;
#alias /static/;
#root /home/ubuntu/virtualenv/myapp/homelaunch/;
}
location / {
proxy_pass http://127.0.0.1:8001;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
#proxy_set_header X-Forwarded-Host $server_name;
#proxy_set_header X-Real-IP $remote_addr;
add_header P3P 'CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV"';
}
}
my ec2 security policy looks like:
What am I doing wrong here?
Thank you!

Answer 1

This didn't appear to be a problem with any settings as much as it was an issue with settings.py, the settings from settings.py weren't being applied because I didn't:
1) Stop Gunicorn and Stop Nginx first
2) Then start them up again using proper commands like:
sudo /usr/local/bin/gunicorn -c /home/ubuntu/virtualenv/gunicorn_config.py myapp.wsgi; sudo nginx -c /etc/nginx/nginx.conf;
Special thanks to user Steve above for the point out.
If anyone runs into a problem like this where your app is accessible via <domainhere>.com, but not www.<domainhere>.com in the future check the following:
1) Make sure your ALLOWED_HOSTS=[] has settings like:
ALLOWED_HOSTS = ['www.myapp.com','myapp.com','<server-ip-here>','ec2-xx-xxx-xxx-xxx.compute-1.amazonaws.com']
2) That you are properly starting both gunicorn and nginx using commands like:
sudo /usr/local/bin/gunicorn -c /home/ubuntu/virtualenv/gunicorn_config.py myapp.wsgi;
sudo nginx -c /etc/nginx/nginx.conf;
3) Use a command like this to check that both are properly running:
ps ax|grep nginx; ps ax|grep gunicorn;
Good luck!