Firebase如何处理跨源问题？ [英] How does Firebase handle cross origin issues?

问题描述

浏览 Firebase 常见问题我看不到跨域问题是如何处理的。显然，我们不想在Firebase域上投放，是否 CORS ，隐藏的iFrame，其他？我们是否需要创建一个指向共享服务器IP的子域？

解决方案

让我回答这个问题两个部分，因为有多种与Firebase服务器进行通信的方式。

• Firebase JavaScript客户端 - Firebase Javascript客户端保持与服务器的实时双向连接。在封面之下，它尽可能使用WebSockets（对于跨源连接没有限制），并且回退到基于隐藏iframe的jsonp在旧浏览器上的long-polling（它只是通过请求来避免跨域问题） 。
Firebase REST API - 您也可以使用REST API从Firebase获取/设置数据，REST API使用CORS来允许跨源请求。 >

所以总的来说，它应该只是工作，你不需要做任何特别的事情。

Looking through the Firebase FAQ I can't see how cross domain issues are handled. Obviously, we don't want to serve on the Firebase domain, is it CORS, hidden iFrame, other? Would we need to create a sub-domain that points at the IP of the sharing server?

解决方案

Let me answer this question in two parts, as there are multiple ways to communicate with the Firebase Servers.

• Firebase JavaScript Client - The Firebase Javascript Client maintains a real-time bidirectional connection to the server. Under the covers, this uses WebSockets whenever possible (which have no limitations with regard to cross-origin connections) and falls back to hidden-iframe-based jsonp long-polling on older browsers (which sidesteps cross-origin issues by only doing requests).
• Firebase REST API - You can also get / set data from Firebase using the REST API, which uses CORS to allow cross-origin requests.

So in summary, it should "just work" and you don't need to do anything special.

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