Why do i get TOO_MANY_REDIRECTS when trying to authenticate against my endpoint?

[solar sonnet]

hello everyone. I have this nginx config:

server {
    listen  80;
    listen 443 ssl;
    ssl_certificate        /etc/letsencrypt/live/sol.l.mycompany.lv/fullchain.pem;
    ssl_certificate_key    /etc/letsencrypt/live/sol.l.mycompany.lv/privkey.pem;
    server_name sol.l.mycompany.lv;
    root /var/www/html;
    access_log /var/log/nginx/sol.l.access.log main;
    error_log /var/log/nginx/sol.l.error.log;
    fastcgi_read_timeout 600s;

    location /sol/ {
        auth_basic "Restricted Area";
        auth_basic_user_file /etc/nginx/.htpasswd_sol;
        proxy_connect_timeout       300;
        proxy_send_timeout          300;
        proxy_read_timeout          300;
        send_timeout                300;
        proxy_pass http://localhost:8080/bgw/sol/;
        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 $scheme;
    }
}

i try to send POST to :https://sol.l.mycompany.lv/. In postman i choose Basic Auth, enter username and password. But i get TOO_MANY_REDIRECTS. Can smb help me out? Thanks in advance!

[keen yarrow]

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[latent lark]

maybe you got a redirection loop in your security config