fix: nginx sse in reverse proxy

flake.nix

@@ -110,6 +110,11 @@
                   locations."/" = {
                     proxyPass = "http://127.0.0.1:${toString cfg.port}";
                   };
+                  extraConfig = ''
+                    # check http://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive
+                    proxy_set_header Connection "";
+                    proxy_http_version 1.1;
+                  '';
                 };
               };
               services.redis.servers.${pname} = {

routes/room_page.go

@@ -70,6 +70,7 @@ func streamingRoomStates(
 		w.Header().Set("Cache-Control", "no-cache")
 		w.Header().Set("Connection", "keep-alive")
 		w.Header().Set("Content-Type", "text/event-stream")
+		w.Header().Set("X-Accel-Buffering", "no")
 
 		templFile := "templates/room.gohtml"
 		tableTemplates := "templates/tableTemplates.gohtml"