问题描述
在我的应用程序中，我使用 angularjs 和cordova 作为前端，使用express 和node js 作为充当服务器的后端.我的客户端在 http://localhost:9000 上运行但是，我的 express js 在 http://localhost:3000.我需要从 express API 获取数据.访问时，它说'
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.
为此，我需要添加 res.addHeader("Access-Control-Allow-Origin", "*").它是从另一个域访问一个域.如何在express js中添加这个标题?请帮帮我..
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..
推荐答案
我也开始了解这个，在搜索时我发现了与此相关的内容.
I'm also started learning about this and while searching I found related to this.
Access-Control-Allow-Origin 只接受 * 或单个来源.
Access-Control-Allow-Origin only accepts * or a single origin.
如果您想支持多个来源但不是全部，那么您必须:
If you want to support multiple origins but not all of them, then you must:
查看 Origin 请求头检查它是否在您可接受的来源列表中把它放在 Access-Control-Allow-Origin 响应头中
look at the Origin request headercheck if it is on your list of acceptable originsput it in the Access-Control-Allow-Origin response header
看看这个，如果它对你有帮助.
See this if it could be helpful to you.
没有Access-Control-Allow-Origin" -节点/Apache 端口问题
这篇关于如何在express js中添加'res.addHeader(“Access-Control-Allow-Origin"，“*")'?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！