How to configure nginx to support signalr3 under cloudflare? - asp.net

Question

I am struggling with signalr3 and nginx reverse proxy configuration, my nginx cfg looks like this:
server {
listen 80;
server_name my.customdomain.com;
location / {
root /pages/my.customdomain.com;
index index.html index.htm;
try_files $uri $uri/ /index.html =404;
}
## send request back to kestrel ##
location /proxy/ {
proxy_pass http://xxxxxxxxxx.westeurope.cloudapp.azure.com/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
What do I miss here?
When I browse my page, I receive OK for
GET /proxy/notifications/negotiate
and
GET /proxy/notifications?id=uFQtMDg1dXib6LGvUssQhQ
but 404 for POST
POST proxy/notifications?id=uFQtMDg1dXib6LGvUssQhQ
pls halp!
ps. my Hub is very simple...
[AllowAnonymous]
public class NotificationHub : Hub
{
}

Answer 1

This is a websocket based app so you need additional nginx config
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-NginX-Proxy true;
#proxy_set_header X-Forwarded-Proto https;
proxy_pass 127.0.0.1:8080;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_ssl_session_reuse off;
proxy_set_header Host $http_host;
proxy_cache_bypass $http_upgrade;
proxy_redirect off;
}