Node.js nginx、aws和cloudflare的cors问题

我有我的网站托管在亚马逊aws。我的应用程序前端使用angular构建，后端使用nodejs express框架构建。该域使用Cloudflare管理，Cloudflare提供免费SSL证书。服务器是使用nginx配置的

一切正常，但突然我的服务器返回403响应。结果，我的API停止工作

我的ngnixn服务器代码：

server {
    index index.php index.html index.htm index.nginx-debian.html;

        server_name api.shajao.com;
    client_max_body_size 500M;
        underscores_in_headers on;
        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
        proxy_pass http://shajao_server;

    proxy_pass_request_headers on;

    client_body_buffer_size    500M;
    client_max_body_size 500M;

        proxy_http_version 1.1;
    proxy_set_header Access-Control-Allow-Origin *;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;

        add_header 'Access-Control-Allow-Origin' '*';
        }

}

var allowCrossDomain = function (req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With, Accept');

    // intercept OPTIONS method
    if ('OPTIONS' === req.method) {
        res.sendStatus(200);
    } else {
        next();
    }
};
app.use(allowCrossDomain);

我的express服务器cors设置：

server {
    index index.php index.html index.htm index.nginx-debian.html;

        server_name api.shajao.com;
    client_max_body_size 500M;
        underscores_in_headers on;
        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
        proxy_pass http://shajao_server;

    proxy_pass_request_headers on;

    client_body_buffer_size    500M;
    client_max_body_size 500M;

        proxy_http_version 1.1;
    proxy_set_header Access-Control-Allow-Origin *;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;

        add_header 'Access-Control-Allow-Origin' '*';
        }

}

var allowCrossDomain = function (req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With, Accept');

    // intercept OPTIONS method
    if ('OPTIONS' === req.method) {
        res.sendStatus(200);
    } else {
        next();
    }
};
app.use(allowCrossDomain);

---

我的网站url:

cloudflare出现了一些问题，导致cors问题。从cloudflare中删除了我的域，从godaddy中管理了我的dns，一切都开始工作，没有任何更改。不知道cloudflare那边发生了什么。如果有人能回答这个问题会更好

你能在这里附加nodejs错误代码吗？我没有看到任何错误。。。我添加了我的网站url。。您可以在控制台中看到cors问题，在网络中您将看到我的api返回403。