在ubuntu上启用CORS支持

Question

我尝试了在线发布的样板“添加标头”的all，以及nginx-extras的“ set_more_headers”，都无济于事。我试过在服务器块和位置块中添加标头。依然没有。我想停止看到此错误：

无法加载https://example.com/api：在飞行前响应中，Access-Control-Allow-Headers不允许请求标头字段Access-Control-Allow-Origin。

这是nginx conf：

server {
    server_name example.com www.example.com;
    root /home/myname/src/clamsy/web;

    access_log /home/myname/src/myapp/web/logs/nginx/access.log;
    error_log  /home/myname/src/myapp/web/logs/nginx/error.log;


    location / {
        add_header 'Access-Control-Allow-Origin' *;
        include proxy_params;
        proxy_pass http://unix:/home/myname/src/myapp/run/myapp.sock;
    }


    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}
server {

    if ($host = www.example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

listen 80;
server_name example.com www.example.com;
return 404; # managed by Certbot

}