Webscoket errors while proxying through HTTPS with apache2

Deployment
1

Hello everyone!

I’m trying to deploy streamlit app on my VPS. Server thst’s in use is Apache2 with SSL certificates generated by certbot.

Streamlit app works well on http://localhost:8501/, as I want to make it public and safe with HTTPS, I’m using apache2 proxy. The configuration is as follows:

<IfModule mod_ssl.c>
<VirtualHost *:443>
    ServerName my.server-name.com
    #RewriteCond %{SERVER_NAME} =my.server-name.com

    RewriteEngine On
    RewriteCond %{HTTP:Upgrade} =websocket [NC]
    RewriteRule /(.*)           ws://localhost:8501/$1 [P,L]
    RewriteCond %{HTTP:Upgrade} !=websocket [NC]
    RewriteRule /(.*)           http://localhost:8501/$1 [P,L]

    ProxyPassReverse / http://localhost:8501/

SSLCertificateFile /path/to/cert/
SSLCertificateKeyFile /path/to/key/
</VirtualHost>
</IfModule>

Apache2 shows no errors whatsoever. When I try to access https://my.server-name.com/. Browser properly uses HTTPS with certs, I’m also redirected to streamlit app, BUT it’s stuck on:

“Please wait…”

When I look at the browser console (F12) it shows followsing errors:

WebsocketConnection WebSocket onerror

and:

Uncaught Error: Unsupported state transition.
State: PINGING_SERVER
Event: CONNECTION_TIMED_OUT

and general information:

WebSocket connection to 'wss://my.server-name.com/stream' failed: WebSocket is closed before the connection is established.

Is there anyting that I should pay attention to? The configuration was taken from streamlit deployment guide. I would be glad for any guidance or suggestions.

2

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