Hello,

I have a problem with wkhtmltopdf on my server on my Ubuntu 16.04 and Odoo 11.
When I connect directly to the whhtmltopdf server works normally.
When I connect to Odoo via the reverse proxy (ngnix), I get a completely empty error message and no PDF.
The proxy backhand is on a separate machine with Ubuntu 18
The reversproxy is in https.

The configuration of my reversproxy is as follows:

upstream odoo_monsite {
    server localIP:8069;
}

server {
    server_name odoo.monsite.ch;

    access_log  /var/log/nginx/odoo.monsite.ch.access.log;
    error_log   /var/log/nginx/odoo.monsite.ch.error.log;

    proxy_buffers 16 64k;
    proxy_buffer_size 128k;

    client_max_body_size 50M;


    location / {
        proxy_pass http://odoo_monsite;
        proxy_set_header    Host               $host;
        proxy_set_header    X-Real-IP          $remote_addr;
        proxy_set_header    X-Forwarded-For    $proxy_add_x_forwarded_for;
        proxy_set_header    X-Forwarded-Proto  https;

        proxy_connect_timeout 30;
        proxy_send_timeout 30;

    }



    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/odoo.monsite.ch/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/odoo.monsite.ch/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}


server {
    if ($host = odoo.monsite.ch) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    server_name odoo.monsite.ch;
    listen 80;
    return 404; # managed by Certbot


}