具有CORS支持的服务器发送事件 [英] Server Sent Events with CORS support

问题描述

我正在使用 ServiceStack中的服务器发送事件，我需要允许它跨源使用.

I am using Server Sent Events in ServiceStack and I need to allow its use across origins.

我已经在我的应用程序中设置了ServiceStack CorsFeature ，但是 ServerEventsFeature 并没有实现这一点.

I have setup the ServiceStack CorsFeature in my application, but this is not honoured by the ServerEventsFeature.

我可以在 OnCreated 中手动添加 Access-Control-Allow-Origin 标头，并允许请求对 event-stream 进行请求，但是对心跳的请求失败，因为我无法对此请求设置标头.

I can manually add the Access-Control-Allow-Origin header in the OnCreated, and that allows requests to event-stream, but requests to the heartbeat fail, because I cannot set a header on this request.

Plugins.Add(new ServerEventsFeature {
    HeartbeatInterval = new TimeSpan(0,0,30),
    OnCreated = (subscription, request) => {
        request.Response.AddHeader("Access-Control-Allow-Origin","*");
    }
    ...
}

由于SSE功能在RawHandler上实现了，我看不到如何将此标头添加到请求中.有没有一种方法可以为所有/event-网址设置标头?

As the SSE functionality is implemented on a RawHandler, I can't see how to get this header into the request. Is there a way I can set the header for all /event- url's?

谢谢.

推荐答案

只有/event-stream 和/event-heartbeat 是原始HTTP处理程序，其他 event-* 路由是通过ServiceStack的请求管道的常规ServiceStack服务.

Only the /event-stream and /event-heartbeat are Raw HTTP Handlers, the other event-* routes are normal ServiceStack services which go through ServiceStack's Request Pipeline.

我添加了一个更改，以自动将 Config.GlobalResponseHeaders 应用于/event-stream 和/event-heartbeat 处理程序 .现在，此更改应在启用CorsFeature时自动添加 CORS标头.

I've added a change to automatically apply Config.GlobalResponseHeaders to both /event-stream and /event-heartbeat handlers in this commit. This change should now automatically add the CORS Headers when CorsFeature is enabled.

我还为/event-heartbeat 回调添加了 OnHeartbeatInit ，以匹配/event-stream OnInit 回调，因此您还可以向心跳处理程序中添加自定义标头.

I've also added OnHeartbeatInit for /event-heartbeat callback to match /event-stream OnInit callback so you can also add custom headers to the Heartbeat handler as well.

Plugins.Add(new ServerEventsFeature {
    HeartbeatInterval = new TimeSpan(0,0,30),
    OnInit = (request) => {
        request.Response.AddHeader(...);
    },
    OnHeartbeatInit = (request) => {
        request.Response.AddHeader(...);
    },
    ...
}

此更改可从 v4.0.34 + 版本开始，该版本现在MyGet .

This change is available from v4.0.34+ that's now available on MyGet.

这篇关于具有CORS支持的服务器发送事件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IT屋！