NGINX CORS

nginx_domain.cong

server {
    listen        80;
    server_name   mydomain.ru;
    access_log    /var/log/nginx/mydomain.ru.access.log;
    error_log     /var/log/nginx/mydomain.ru.error.log;
    rewrite_log   on;

    # задаем красивую страницу 50x для пятисотых ошибок
    error_page 500 502 503 504 /50x.html;
    location = /50x.html { 
        root /usr/share/nginx/html;
    }
    
    location / {
    
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
        
        add_header 'Access-Control-Allow-Origin' '*' always;
        
        proxy_pass http://BACKEND_SERVER_ADDR:80;
        include fastcgi_params;
        fastcgi_param REMOTE_ADDR $http_x_real_ip;
        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-Host $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 300;
        fastcgi_read_timeout 300;
    }
}