Does not work with Server-Sent Events

[pallymore]

So I'm working on a small application which uses Server-Sent Events...everything works perfectly in my local environment, but the server refuses to push out any messages when the app runs on heroku.

I spent quite a few hours trying to debug this.. Then I found out it's because I'm using compression middleware in production environment. everything works again as soon as I remove it.

I'm using the basic SSE implementation, not using any third party library for that. You should be able to reproduce this issue by adding this middleware to any expressjs + SSE code examples. (like this one: https://github.com/TravelingTechGuy/express-eventsource)

I'm fairly new to expressjs. I'd be great if this can be solved (or if anyone can provide a workaround solution).

Thanks!

[dougwilson]

You need to call res.flush() after you write your event if you want it actually flushed out to the client. For your demo there, you want to add res.flush() after line 60: https://github.com/TravelingTechGuy/express-eventsource/blob/master/models/eventsource.js#L60 and it works fine.

[pallymore]

ah...thanks! :)

[pallymore]

Actually...it seems there's no such method :/
(as of ExpressJS 4)
http://nodejs.org/api/http.html#http_response_write_chunk_encoding

[dougwilson]

res.flush is added by this library: https://github.com/expressjs/compression/blob/master/index.js#L161

I do need to add that to the readme, it seems.

[pallymore]

thanks again! works perfectly now :)

[dougwilson]

Awesome! I need to add this information to the README, haha. I'm going to keep this open until I do :)