HTTPS and Websockets

[sova]

Hello,

Is there something special I should know if I want to use Sente with HTTPS?

I am trying now to run my clojurescript project that has a clojure backend on my SSL-enabled Apache box and my websockets are telling me that "200" is an unexpected error code o_O

[sova]

[danielcompton]

Sente is expecting a 1xx (I forget the exact number) status code to switch protocols from HTTP(S) to WS(S). Can you check that you've configured Apache to accept WS connections?

[sova]

Oh cool, I did not know that. I suspected as much, that Apache2 would be the culprit! Thanks a lot for the quick feedback, I shall look into it! I'm not sure where that switch lives.

[sova]

Well, after some battling with Apache2.4.7 I now have some educated questions:

My "/login" is also not working, throwing me a 403 Forbidden. Not sure why that is happening.

Is there a particular WebSocket port that sente uses, or is redirecting to the port of my running application through lein start (i.e. wss://localhost:56721/ ) sufficient?

Where can I learn more about how sente does websockets and WSS if it's https? Should I just have it redirect to ws:// ~ and expect that it shall shift itself?

Thanks for any help.

[sova]

Hello

I eventually had to do a lot of fun stuff in my apache configuration (/sites-enabled/mydomain-ssl.conf)

One instruction that was absolutely necessary to get websockets to work looks like this

<VirtualHost *:80>
  ServerName www.domain2.com

  RewriteEngine On
  RewriteCond %{HTTP:Upgrade} =websocket [NC]
  RewriteRule /(.*)           ws://localhost:3001/$1 [P,L]
  RewriteCond %{HTTP:Upgrade} !=websocket [NC]
  RewriteRule /(.*)           http://localhost:3001/$1 [P,L]

  ProxyPassReverse / http://localhost:3001/
</VirtualHost>

Which I got from this awesome stack overflow answer (the second one) here https://stackoverflow.com/questions/27526281/websockets-and-apache-proxy-how-to-configure-mod-proxy-wstunnel/35141086#35141086

In case somebody else is going nuts with SSL-based websockets over apache2.4.7 or similar

[WorldsEndless]

Thank you for this fix! It rescued our application after a lot of debugging. I wrote about solving our issue here: https://tech.toryanderson.com/2020/10/26/websockets-for-clojure-sente-in-apache-reverse-proxy/