Websocket proxy (no replies)

This must have been discussed before but I am new to nginx
and this forum.

I am upgrading to 1.4 to use its websocket proxy feature.
Say I have a websocket server running at port 81, so I want
to forward all websocket packets to port 81, and process
the rest at port 80.

Somehow the following conf doesn't work, anything missing?

server {
listen [::]:80 ipv6only=off;

location / {
regular_http_processing_directive;

if ($http_upgrade = "websocket") {
proxy_pass http://localhost:81;
}

proxy_http_version 1.1;
proxy_set_header Upgrade websocket;
proxy_set_header Connection upgrade;
}
}

- Alder
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