Reverse proxy using NGINX

[taras.if.ua (Taras)]

Hello! Could anyone help me with fix next error. I have Nginx installed on VPS. My Raspberry Pi connected to this VPS via Wireguard. I set up reverse proxy to get access to my HA installation. Here is my config:

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name homeassistant.myserver.com www.homeassistant.myserver.com;

    add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";
    # add_header 'Cache-Control' 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;
    ssl_ciphers "EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:DHE+AESGCM:DHE:!RSA!aNULL:!eNULL:!LOW:!RC4:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS:!CAMELLIA:!SEED";
    ssl_session_tickets off;

    ssl    on;
    ssl_certificate    /etc/ssl/cert.pem;
    ssl_certificate_key    /etc/ssl/key.key;

    proxy_buffering off;

    location / {
        proxy_pass http://10.66.66.2:8123;
        proxy_set_header Host $host;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
    }

     location /api/websocket {
        proxy_pass http://10.66.66.2:8123/api/websocket;
        proxy_set_header Host $host;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
     }
}

The problem is, that HACS doesn’t work through Nginx proxy. I’m getting error, as on screenshot, and HACS resources don’t load with error 404. Everything else seems works ok. I also have Nextcloud installed on RPI, it works perfectly via proxy. The problem is only with HACS addon. Here is same question, but no answer. Please, help me, I’m struggling for a 4 days with that and nothing…