javascript - How to use server-sent-events in express.js -

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i setup rest server express.js. want add sse server. after implemented this sse package, error. know error, when try use res.send twice, not.

error: error: can't set headers after sent.                                                 @ serverresponse.outgoingmessage.setheader (http.js:690:11)                                 @ serverresponse.header (/home/root/node_modules/express/lib/response.js:718:10)              @ serverresponse.send (/home/root/node_modules/express/lib/response.js:163:12)                 @ app.get.str (/home/root/.node_app_slot/main.js:1330:25)                                      @ layer.handle [as handle_request] (/home/root/node_modules/express/lib/router/layer.js:95:5)         @ next (/home/root/node_modules/express/lib/router/route.js:131:13)                            @ sse (/home/root/node_modules/server-sent-events/index.js:35:2)                               @ layer.handle [as handle_request] (/home/root/node_modules/express/lib/router/layer.js:95:5)       @ next (/home/root/node_modules/express/lib/router/route.js:131:13)                               @ route.dispatch (/home/root/node_modules/express/lib/router/route.js:112:3)

is possible can't use express methods anymore within sse function? example:

app.get('/events', sse, function(req, res) {     res.send('...'); });

furthermore, found this solution , this. possible make sse res.write function or in way without using package?

you can achieve without other packages.

i wrote blog post this, part 1 sets out basics.


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