How to add 'res.addHeader(“Access-Control-Allo

问题:

In my app I use angularjs and cordova for front-end and express and node js for backend which is acting as server. My client side is running on http://localhost:9000 but, my express js is running on http://localhost:3000. I need to get data from express API. While accessing, it says '

 XMLHttpRequest cannot load http://localhost:3000/data. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:9000' is therefore not allowed access.

For this, i need to add res.addHeader("Access-Control-Allow-Origin", "*"). It is to access one domain from other domain. How to add this header in express js? Please, help me out..

回答1:

I'm also started learning about this and while searching I found related to this.

Access-Control-Allow-Origin only accepts * or a single origin.

If you want to support multiple origins but not all of them, then you must:

look at the Origin request header check if it is on your list of acceptable origins put it in the Access-Control-Allow-Origin response header

See this if it could be helpful to you.

No 'Access-Control-Allow-Origin' - Node / Apache Port Issue