Nginx反向代理导致gitlab频繁退出

Question

我正在使用 nginx 作为 gitlab 的反向代理。通过此代理访问 gitlab 时，我经常遇到注销。显然，gitlab 无法可靠地维护/识别会话。直接访问 gitlab 时（我使用 VPN 直接访问 gitlab，然后通过纯 http）不会发生此问题。有人知道为什么会发生这种情况吗？这是我的 gitlab 的 nginx 配置

server {
    listen 443;
    listen [::]:443;
    server_name gitlab.company.de;
    client_max_body_size 0;
    include /etc/nginx/ssl.conf;
    include /etc/nginx/hsts.conf;

    location / {

        client_max_body_size 0;
        gzip off;
        # following line added after penetration test from Nicklas
        add_header Set-Cookie "Path=/; HttpOnly; Secure";

        proxy_read_timeout 300;
        proxy_connect_timeout 300;
        proxy_redirect off;

        proxy_http_version 1.1;
        proxy_buffering off;


        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-Ssl on;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_pass http://10.10.90.10;

    }

}