[coder543]

I think their information could be outdated. Since Firefox 82, you can supposedly inspect the content of SSE streams: https://developer.mozilla.org/en-US/docs/Tools/Network_Monit...

Before that... yeah, the Firefox dev tools were not very helpful for SSE.

[mmcclimon]

Hmm! You're right that I hadn't looked it a while, so I checked before making the comment above. I'm still seeing the same thing I always have, which is "No response data available for this request". Possibly something is slightly wrong somewhere (though Chrome dev tools seem fine on the same), but you've given me something to look into, thanks!

[coder543]

That is interesting. I just tested it myself, and at least for my setup (Firefox on Mac on ARM), the events only showed up in the dev tools if the server closed the SSE connection... so, maybe Firefox still hasn't fully fixed this problem.

[mmcclimon]

Yeah, that seems to be the case (confirmed with their little example at https://github.com/mdn/dom-examples/tree/master/server-sent-...). Once the connection is closed you can see things, but that's not particularly useful for debugging!