Server Sent Events from functions?

[Hal Heisler]

Hi readers, I'm new here.

I have an api function implemented in nuxt3.  It should send 10 SSE data events spaced one second apart.

When I run locally with emulator It works as expected.

When I call the function via the deployed endpoint, it takes 10 seconds for the response to arrive. I have a repo to demonstrate this. Additional notes in the Readme there.

repo:  https://github.com/sig9/nuxt-app-sse/tree/firebase
deployment URL: https://testdeleteme-7a825.web.app/api/sse/demo

Firebase is very new to me, would appreciate any tips on if this can work or if there are limitations to streaming responses with SSE. 

[Michael Bleigh]

Firebase Hosting does not currently support streaming responses (e.g. server-sent events, websockets) in rewrites to Cloud Functions / Cloud Run. The entire response is buffered and cached in the CDN layer.

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[Hal Heisler]

Well that's too bad. Would be cool if the firebase  hosting emulator had the same behaviour as production WRT streaming. Could save a dev a few iterations. 

Will continue my search for the best way to host a nuxt3 app with some server-sent event functions. I might need to look away from serverless frameworks. So far firebase hosting and azure node functions have streaming limitations.

BTW, this being my first look at firebase hosting, I love the response headers. Great info there.

Thanks- Hal