IONIC，Access-Control-Allow-Origin [英] IONIC, Access-Control-Allow-Origin

问题描述

我尝试使用以下代码发送带有$ http（angular）的http请求：

I try to send http request with $http (angular) with this code:

$http({
              method: 'GET',
              url: 'http://192.168.0.17:9000',
              header: {'Access-Control-Allow-Origin': "*"},
        }).then(getEventsSuccess, getEventsError);

但这不起作用，我在网络控制台中出现此错误：

But this doesn't work and I have in the web console this error:

XMLHttpRequest cannot load http://192.168.0.17:9000/. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access.

你有解决方案吗？

推荐答案

由于浏览器中实现的安全机制，您会看到此错误，称为同源策略。

You see this error due to a security mechanism implemented in your browser, called Same Origin Policy.

基本上，它是由于您的网页尝试访问位于与网页本身不同的主机，端口或方案（HTTP / HTTPS /文件等）上的服务器上的资源。

Basically, it is caused since your webpage tries to access a resource which resides on a server that is on a different Host, Port or Scheme (HTTP / HTTPS / file etc) than the webpage itself.

要解决此问题，您可以执行以下操作之一：

In order to solve this issue, you can do one of the following:

• 从您尝试访问的服务器提供网页。如果您的网页网址为 http://192.168.0.17:9000/X.html ，请求应该成功并且错误将消失。


• 为从服务器发送的响应添加一个特殊标头，称为Access-Control-Allow-Origin。

• Serve your Webpage from the server that you are trying to access. If your webpage URL will be http://192.168.0.17:9000/X.html, your request should be successful and the error will disappear.
• Add a special header to the response sent from your server, called Access-Control-Allow-Origin.

在此处阅读更多内容：
https://en.wikipedia.org/wiki/Same-origin_policy
https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS

Read more here: https://en.wikipedia.org/wiki/Same-origin_policy https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS

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