CORS问题：“ Access-Control-Allow-Origin”标头不得包含多个值

问题描述

我想允许我的服务器允许两个不同的域读取数据而不会出现CORS问题。

I want to allow my server to let two different domains read data without getting a CORS issue.

因此，我在node.js中编写了以下代码行：

Therefore, I wrote the following code line (in node.js):

app.use(function(req, res, next){
   res.header("Access-Control-Allow-Origin", ["http://ServerA:3000", "http://ServerB:3000"]);
   res.header("Access-Control-Allow-Headers", "*");
   next();
});

但是，当我通过浏览器发送请求时，出现错误：

However, when I sent the request by the browser I got the error:

我的问题是如何为多个来源定义 Access-Control-Allow-Origin。我不想使用 *，因为它太宽松了。

My question is how to define 'Access-Control-Allow-Origin for more than one origin. I don't want to use '*' because it is too liberal.

推荐答案

您需要使用配置文件中的内容检查当前来源：

You need to check your current origin with the ones that you have in the config:

let allowedOrigins = ["http://ServerA:3000", "http://ServerB:3000"]
let origin = req.headers.origin;
if (allowedOrigins.includes(origin)) {
    res.header("Access-Control-Allow-Origin", origin); // restrict it to the required domain
}

标头只期望起源或通配符，这就是为什么它对您不起作用的原因

The header expects only one value of the origin, or a wildcard sign, that's why it's not working for you

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