How to close SSE connection from browser

[charliematters]

I'm trying to use useEventSource, but I notice that when it unmounts it closes the source, but that doesn't trigger the abort controller on the server. Is this by design, or am I doing something wrong?

[charliematters]

The context here is that I'm proxying a SSE endpoint on another server, so when the user leaves the page with the server events on, I want to tidy up and close the connection from remix to the other API.

[sergiodxa]

The abort controller is not closed by useEventSource, the HTTP server is in charge of that, so it may be a bug in your HTTP server.

[charliematters]

You're right - it looks like it's:

• slightly flaky support from the browser - some times it just won't close the connection (as far as I can tell)
• a failing with the vite dev server as seen here: Vite dev server not observing SSE close event from client MatthewWid/better-sse#50