Restructure nginx configuration

angular-frontend/Dockerfile

@@ -2,6 +2,7 @@ FROM nginxinc/nginx-unprivileged:stable
 
 COPY dist/angular-frontend /usr/share/nginx/html
 RUN mkdir /etc/nginx/templates
-COPY nginx.conf  /etc/nginx/templates/default.conf.template
+COPY backend.nginx.conf.template /etc/nginx/templates/backend.conf.template
+COPY nginx.conf /etc/nginx/conf.d/websocket.conf
 
 EXPOSE 80

angular-frontend/nginx.conf

@@ -1,36 +1,7 @@
-server {
-    listen 80;
-    sendfile on;
-    default_type application/octet-stream;
-    tcp_nopush on;
-    tcp_nodelay on;
-
+http {
     # Connection header for WebSocket reverse proxy
     map $http_upgrade $connection_upgrade {
         default upgrade;
-        ''      close;
-    }
-
-    gzip on;
-    gzip_http_version 1.1;
-    gzip_disable "MSIE [1-6]\.";
-    gzip_min_length 256;
-    gzip_vary on;
-    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;
-    gzip_comp_level 9;
-
-    root /usr/share/nginx/html;
-
-    location / {
-        try_files $uri $uri/ /index.html =404;
-    }
-
-    location ~ \/(connect|app|topic)\/ {
-        proxy_pass ${SPRING_BACKEND}$1;
-        proxy_http_version 1.1;
-        proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection $connection_upgrade;
-        proxy_set_header Host $host;
+        ""      close;
     }
 }