update for signalR

deploy/nginx/conf.d/rolac.conf

@@ -1,3 +1,10 @@
+# SignalR WebSocket upgrade helper (see /hubs/ block). Must be in http context or
+# nginx fails config test: [emerg] unknown "connection_upgrade" variable.
+map $http_upgrade $connection_upgrade {
+  default upgrade;
+  ''      close;
+}
+
 server {                      # HTTP -> HTTPS
   listen 80;
   server_name app.rolac.org api.rolac.org;
@@ -23,6 +30,22 @@ server {
     proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header   X-Forwarded-Proto $scheme;
   }
+  # SignalR hubs -> api container (Kestrel), same as /api/. Without this, /hubs/*
+  # falls through to "location /" (the static app), whose nginx 405s the negotiate
+  # POST so the connection never reaches the backend. Upgrade/Connection headers +
+  # http_version 1.1 let the WebSocket transport establish instead of long-polling.
+  location /hubs/ {
+    proxy_pass         http://api:8080/hubs/;
+    proxy_http_version 1.1;
+    proxy_set_header   Upgrade $http_upgrade;
+    proxy_set_header   Connection $connection_upgrade;
+    proxy_set_header   Host $host;
+    proxy_set_header   X-Real-IP $remote_addr;
+    proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header   X-Forwarded-Proto $scheme;
+    proxy_buffering    off;
+    proxy_read_timeout 100s;
+  }
   location / {
     proxy_pass http://app:80;
   }