nginx: disable gzip for SSE endpoints

Gzip buffers output by default to optimize compression. This buffering delays the transmission of
events—breaking the “real-time” feel of SSE. Instead of seeing each event instantly, the client
might see a batch of events all at once after the gzip buffer flushes (which could take seconds or more).

gzip_types is a whitelist . But certain modules like proxies can not honor it.

src/nginxconfig.ejs

@@ -131,8 +131,11 @@ server {
     gzip_min_length 18k;
     gzip_types text/css text/javascript text/xml text/plain application/javascript application/x-javascript application/json;
 
-    # enable for proxied requests as well
-    gzip_proxied any;
+    # compression chunking logic will interfere with SSE packet flushing
+    gzip_disable "text/event-stream";
+
+    # what responses are proxied
+    gzip_proxied no-cache no-store private expired auth;
 
 <% if ( endpoint === 'dashboard' || endpoint === 'ip' || endpoint === 'setup' ) { -%>
     # CSP headers for the dashboard resources