try adding /chat/ route, following directions:

    https://docs.mattermost.com/install/config-proxy-nginx.html

diff --git a/etc/nginx/sites-available/default b/etc/nginx/sites-available/default
index 6858f145a3f63d7b6eed7f435f66e18d88cf98f6..bd560b40c80fbdfe436f638b8b3eb59916e238d4 100644 (file)
--- a/etc/nginx/sites-available/default
+++ b/etc/nginx/sites-available/default
@@ -41,6 +41,29 @@ server {
   }
 
 
+  # Matter most (Chat / Slack alternative)
+  location /chat/ {
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+    client_max_body_size 50M;
+    proxy_set_header Host $http_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_set_header X-Frame-Options SAMEORIGIN;
+    proxy_buffers 256 16k;
+    proxy_buffer_size 16k;
+    client_body_timeout 60;
+    send_timeout 300;
+    lingering_timeout 5;
+    proxy_connect_timeout 90;
+    proxy_send_timeout 300;
+    proxy_read_timeout 90s;
+    proxy_http_version 1.1;
+    proxy_pass http://localhost:8065;
+  }
+
+
   # default favicon
   location = /favicon.ico {
     alias /var/www/favicon.gif;