Failed to load http://localhost:3000/products: The 'Access-Control-Allow-Origin' header has a value

用node写了个接口，但是启动前端的时候一直请求不到数据，报错

Failed to load http://localhost:3000/products: The ‘Access-Control-Allow-Origin’ header has a value ‘http://127.0.0.1:3000’ that is not equal to the supplied origin.

后来在node后端设置了一个请求头，也就是serve.on()里加了一行代码，设置一个请求头，问题就解决了。
不是刚开始想的跨域问题

res.setHeader("Access-Control-Allow-Origin", "*");

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Failed to load http://localhost:3000/products: The 'Access-Control-Allow-Origin' header has a value

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