Nginx Reverse Proxy to azurewebsites.net on an IPv6 Host behind CloudFlare

myapp_azurewebsites.conf

# Nginx configuration file for a simple reverse proxy from a domain to azurewebsites.net
# References: https://withouttheloop.com/articles/2017-07-23-nginx-letsencrypt-azure-web-app/
# Note: Ensure your AAAA records for your domain under CloudFlare are configured!
# A records are not needed since Cloudflare will be proxying IPv6 to IPv4 requests for us.

server {
    listen 80;
    listen [::]:80;
    server_name myapp.site www.myapp.site;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host myapp.azurewebsites.net;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_ssl_session_reuse off;
        proxy_pass https://myapp.azurewebsites.net;
        proxy_redirect off;
    }
}