Attempting to reconnect to the server 1 of 8 - apache

Question

Problem with Blazor Test application. I run this app. over Apache server with proxy:
<VirtualHost *:*>
RequestHeader set \"X-Forwarded-Proto\" expr=%{REQUEST_SCHEME}
</VirtualHost>
Listen 192.168.0.190:44366
# for ASP.NET app TestBlazor
<VirtualHost 192.168.0.190:44366>
ProxyPreserveHost On
ProxyPass / http://127.0.0.1:44366/
ProxyPassReverse / http://127.0.0.1:44366/
ServerName 192.168.0.190:44366
# ServerAlias 192.168.0.190:44366
</VirtualHost>
However, a message appears every minute: Attempting to reconnect to the server. Where can be problem ?
Firefox console:

Answer 1

I found the answer here:WebSockets and Apache proxy : how to configure mod_proxy_wstunnel?
Virtual host must be configured as follows:
<VirtualHost *:*>
RequestHeader set \"X-Forwarded-Proto\" expr=%{REQUEST_SCHEME}
</VirtualHost>
Listen 192.168.0.190:44366
# for ASP.NET app TestBlazor
<VirtualHost 192.168.0.190:44366>
ServerName 192.168.0.190:44366
RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://localhost:44366/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule /(.*) http://localhost:44366/$1 [P,L]
ProxyPass / http://localhost:44366/
ProxyPassReverse / http://localhost:44366/
</VirtualHost>