Server-sent events support

[sunng87]

Attempt to add support for server-sent events(SSE) on current ring model, like how we supported websocket.

[rawoke083]

Any progress on this ?

[sunng87]

I did some early investigation that SSE may not require adapter level support. It can be implemented via a library in ring ecosystem, like https://github.com/bobby/ring-sse/

I don't have real-world use case for SSE at the moment. Could you please check if the library work for you?

[rawoke083]

Thanks, I saw that library, it's 4 years since it's been last updated, also could not figure out how to hook it up to a normal ring-application. Once again there seems to be only cryptic code snippets. I've asked the author to provide a minimal working example 6 days ago, no joy this far.

Seems to be the common problem in Clojure, Either completely out of date libraries or these extreme short and cryptic code-snippets that should somehow be regarded as documentation or examples. :/

[TimoKramer]

https://github.com/kumarshantanu/ring-sse-middleware

[lnostdal]

I'm surprised SSE doesn't seem to work. Does other forms of streaming HTTP responses work?

edit: By the way, the original ring project is upgrading to Jetty 11 now: ring-clojure/ring#481 ...still alpha, but SSE seems to work.

[sunng87]

Did you see any error log, or error behavior with SSE on this adapter? I might be able to create a fix for that.

[lnostdal]

It seems to go silent, no error, and no HTTP response. Then after a while the connection closes.