如何添加“res.addHeader（QUOT;访问控制允许来源＆QUOT;，＆QUOT; * QUOT;）”中的前preSS JS？ [英] How to add 'res.addHeader("Access-Control-Allow-Origin", "*")' in express js?

问题描述

在我的应用我使用angularjs和科尔多瓦的前端和前preSS和后端其中充当服务器节点的js。我的客户端是在运行的http：//本地主机：9000 但是，我的前preSS JS是在<运行HREF =HTTP：//本地主机：3000相对=nofollow> HTTP：//本地主机：3000 。我需要从EX preSS API获取数据。当访问，上面写着

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.

对于这一点，我需要添加 res.addHeader（访问控制允许来源，*）。这是从其他域访问一个域。如何添加在EX preSS JS这个头？请帮我..

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

我也开始学习这件事，同时寻找，我发现与此相关的。

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

访问控制允许来源只接受*或单一起源。

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

如果你想支持多种来源，但不是所有的人，那么你必须：

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

看产地请求头
检查它是否是你可以接受的起源名单
把它放在访问控制允许来源响应头

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

请参阅本如果能对您有所帮助。

See this if it could be helpful to you.

<一个href=\"http://stackoverflow.com/questions/18310394/no-access-control-allow-origin-node-apache-port-issue\">No 访问控制允许来源 - 节点/ Apache的端口号

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