Django + Nginx + Gunicorn example.com有效，但www.example.com返回Bad Request（400）

Question

我试图访问www.example.com以及example.com工作正常，但它返回Bad Request 400：

Django的：

ALLOWED_HOSTS = ['librestock.com', 'www.librestock.com']

Nginx的：

server {
    listen 80;
    server_name librestock.com www.librestock.com;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/david/StockSearch/stocksearch;
    }

    location / {
        include proxy_params;
        proxy_set_header        X-Real-IP       $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://unix:/home/david/StockSearch/stocksearch/stocksearch.sock;
    }
}

有关调试和排除故障的任何想法吗？