Rails 4, Puma, Nginx - ActionController::Live Streaming dies after first chunk sent
Solved
It turns out all that I needed was this line in my location directive to get streaming working through nginx:
proxy_http_version 1.1;
I discovered this fix when investigating the keepalive directive in nginx's upstream module:
http://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive
This piece of text in particular clued me in:
For HTTP, the proxy_http_version directive should be set to “1.1” and the “Connection” header field should be cleared:upstream http_backend { server 127.0.0.1:8080; keepalive 16;}server { ... location /http/ { proxy_pass http://http_backend; proxy_http_version 1.1; proxy_set_header Connection ""; ... }}It seems that nginx defaults to, proxy_http_version 1.0;
And according to Wikipedia, http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol
HTTP/1.1 introduced chunked transfer encoding to allow content on persistent connections to be streamed rather than buffered.
So there was my problem.
TIL