Make Nginx Proxy only upgrade SignalR WebSocket connections in Docker Compose stack - docker

Question

Is there a way to only upgrade SignalR WebSocket connections in your nginx.conf file without duplicating a whole section?
ASP.NET Core is rejecting my SignalR connections when they're not upgraded, however I'm running an API on that ASP.NET Core project that won't accept POST Request with bodies when the requests have the header "Connection: "upgrade"".
My current solution is just to duplicate the "location" section in my nginx.conf file as you see below. Is there a more elegant solution?
Thanks!
My nginx.conf file:
worker_processes 1;
events {
worker_connections 1024;
}
http {
server {
listen 80;
include /etc/nginx/mime.types;
gzip on;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
location / {
proxy_pass http://ui:80;
rewrite ^/(.*)$ /$1 break;
}
location /shopvac/signalr {
proxy_pass http://shopvac:80;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
rewrite ^/shopvac/(.*)$ /$1 break;
}
location /shopvac {
proxy_pass http://shopvac:80;
rewrite ^/shopvac/(.*)$ /$1 break;
}
}
}
My docker-compose.yaml file:
version: "3"
networks:
proxy:
database:
volumes:
database-data:
services:
proxy:
image: nginx:latest
depends_on:
- ui
- shopvac
volumes:
- ./nginx.conf:/etc/nginx/nginx.conf
- ./logs/nginx:/var/log/nginx
ports:
- "80:80"
- "443:443"
networks:
- proxy
database:
image: postgres:latest
volumes:
- database-data:/var/lib/postgresql/data
expose:
- "5432"
networks:
- database
environment:
- POSTGRES_DB=home-system
- POSTGRES_USER=home-system
ui:
build:
context: ./ui
dockerfile: Dockerfile
expose:
- "80"
networks:
- proxy
shopvac:
build:
context: ./shopvac
dockerfile: Dockerfile
depends_on:
- database
volumes:
- /app
expose:
- "8080"
networks:
- proxy
- database

Answer 1

Found a solution!
So you can edit the "proxy_set_header Connection" property in nginx.conf to pass the necessary value forward.
The important section of the nginx.conf is now as follows:
location /shopvac {
proxy_pass http://shopvac:80;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $http_connection;
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
rewrite ^/shopvac/(.*)$ /$1 break;
}