在App.get中，我希望有两个不同的响应（通道）

Question

我正在使用expressjs，在app.get中，我想要一个带有一个URL（app.get）的响应列表。 基本上我尝试第二次运行res.writeHead（）时遇到错误。 这是错误：

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at validateHeader (_http_outgoing.js:503:11)
at ServerResponse.setHeader (_http_outgoing.js:510:3)
at ServerResponse.writeHead (_http_server.js:225:21)
at SSEChannel.subscribe (/home/pouya/Documents/nodejs/pubsub/sse-pubsub.js:39:9)
at app.get (/home/pouya/Documents/nodejs/pubsub/server.js:57:29)
at Layer.handle [as handle_request] (/home/pouya/Documents/nodejs/pubsub/node_modules/express/lib/router/layer.js:95:5)
at next (/home/pouya/Documents/nodejs/pubsub/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/home/pouya/Documents/nodejs/pubsub/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/home/pouya/Documents/nodejs/pubsub/node_modules/express/lib/router/layer.js:95:5)
at /home/pouya/Documents/nodejs/pubsub/node_modules/express/lib/router/index.js:281:22

任何想法，我该如何解决？

因此，这是我处理SSE渠道的经纪人的一部分：

app.get('/bob/sub/*', (req, res, next) => {

const channel = req.params['0'];
if(channel.includes(multilevel_indicator) || channel.includes(singlelevel_indicator))
{
    for (let [sseChannel, value] of Object.entries(sseChannels)) {
        if(wildcard(sseChannel, channel))
        {
            console.log("wildcard sub", sseChannel);
            sseChannels[sseChannel].subscribe(req, res);
        }
    }
}}

这是我的订阅功能的一部分

   subscribe(req, res) {
    const c = {req, res};
    c.req.socket.setNoDelay(true);
    c.res.writeHead(200, {
        "Content-Type": "text/event-stream",
        "Cache-Control": "s-maxage="+(Math.floor(this.options.maxStreamDuration/1000)-1)+"; max-age=0; stale-while-revalidate=0; stale-if-error=0",
        "Connection": "keep-alive"
    });
    return c;
}

这是我的sse客户端的一部分：

const es = new EventSource("/bob/sub/#");
    console.log(channelName);
    es.addEventListener('myEvent', ev => {
        const data = JSON.parse(ev.data);
    });