Nginx rewrite if file not found</h1>

Если картинка не найдена в текущем локации – реврайт на запасную

        location /pictures {
            root /var/hosting/;
            autoindex_exact_size off;
            autoindex off;
            try_files $uri @pictures2 ;
        }
        location /pictures2 {
            root /var/hosting/;
            autoindex_exact_size off;
            autoindex off;
        }
        location @pictures2 {
        rewrite ^/pictures/(.*) https://itc-life.ru/pictures2/$1 break;
        }

Для proxy_pass

location /uploads/calls/ {
    proxy_pass   http://nginx-backend:80/uploads/calls/;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-Server $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;
    proxy_connect_timeout 120;
    proxy_send_timeout 120;
    proxy_read_timeout 180;
    proxy_intercept_errors on;
    error_page 404 = @asterisk_2;
}
location @asterisk_2 {
    proxy_pass http://10.26.0.35:85;
}