EventSource / Server-Sent Events through Nginx
nginx, ruby, sinatra
Solution
Your Nginx config is correct, you just miss few lines.
Here is a "magic trio" making `EventSource` working through Nginx:
proxy_set_header Connection '';
proxy_http_version 1.1;
chunked_transfer_encoding off;
Place them into `location` section and it should work.
You may also need to add
proxy_buffering off;
proxy_cache off;
That's not an official way of doing it.
I ended up with this by "trial and errors" + "googling" :)
Problem
On server-side using Sinatra with a `stream` block. ``` get '/stream', :provides => 'text/event-stream' do stream :keep_open do |out| connections << out out.callback { connections.delete(out) } end end ``` On client side: ``` var es = new EventSource('/stream'); es.onmessage = function(e) { $('#chat').append(e.data + "\n") }; ``` When i using app directly, via `http://localhost:9292/`, everything works perfect. The connection is persistent and all messages are passed to all clients. However when it goes through Nginx, `http://chat.dev`, the connection are dropped and a reconnection fires every second or so. Nginx setup looks ok to me: ``` upstream chat_dev_upstream { server 127.0.0.1:9292; } server { listen 80; server_name chat.dev; location / { proxy_pass http://chat_dev_upstream; proxy_buffering off; proxy_cache off; proxy_set_header Host $host; } } ``` Tried `keepalive 1024` in `upstream` section as well as `proxy_set_header Connection keep-alive;`in `location`. Nothing helps :( No persistent connections and messages not passed to any clients.