Sample Server Sent Event

This is a POC of issue #369, ERR_MULTIPLE_CALLBACK.

Env:

Node v12.17.0, v12.18.0

Setup

I am facing this issue with https, so i am providing certs for this POC. You may need to inject/generate your own certs. You can place key and certs under ./certs folder, like:

-- certs
   |--- server.key
   |--- server.crt

If you have a different registered port, you can update it in server.js, line 11

Start the app

npm install
npm start

Then you should be able to see the page running on the PORT. There is two buttons where you can easily start/stop SSE.

Issue identified

After you stop the SSE on the page, you should be able to see the following error in console.

Notice here i print out the stopping time in both page and terminal, there is a little gap between them. Actually, the printed time in terminal is the time which next message will be sent.

Fix:

spdy-http2/handle-thing#16