Hi,
A proxy, in general terms, consists of a server socket and a http client,
> it's basic operation is to handle incoming requests to its server socket by
> issuing http requests to a backend using the http client. Keeping that in
> mind the keep-alive parameter applies to the http request that exists
> between a browser and the the proxy's server socket. The request to the
> backend in an entirely separate request and has its own parameters. It can
> even be, and habitually is, a different protocol (think ssl offloading or a
> fast cgi backend).
>
That's actually precisely what I am doing too.
I am using a rather standard NginX configuration for this:
server {
listen 66.240.255.3:443 ssl http2;
#server_name www.wonder-app.com ;
server_name www.wonder-app.com;
client_max_body_size 0;
ssl_certificate /etc/nginx/ssl/www.xxxx.com.crt;
ssl_dhparam /etc/nginx/ssl/dhparam.pem;
ssl_certificate_key /etc/nginx/ssl/www.xxxx.com.key;
location / {
proxy_pass http://localhost:8080;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
Thus, unless your proxy uses keep alive on the upstream request, you don't
> have to worry about that.
>
Yep -- and it doesn't.
> That's my case, the proxy we use is a custom built node http proxy based
> solution that does not use keep-alive on the backend requests.
>
That's interesting. How come you built your own?
> It's also the default for nginx (http://nginx.org/en/docs/
> http/ngx_http_upstream_module.html#keepalive)
>
Yep.
And since websockets is mainly for real-time messaging, and the client has
already been programmed so that if the connection drops it simply gets
re-established, it won't matter too much if the websockets get killed off
once the server is shut down...
I assumed that a keepalive connection from the client to the nginx server
would imply a keep-alive connection from nginx to the local node server
listening to an unprivileged port... but that's obviously not the case!
(Does that even matter? Would you ever want a keep-alive connection between
the proxy and the local node?)
Merc.
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