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Description
Steps to Reproduce
- Running the overleaf docker listening on 127.0.0.1:8080 and exposing it via an Apache 2.4 reverse proxy at https://overleaf.my-own-server.com.
- Opening a project on the main landing page via the reverse proxy, (like https://overleaf.my-own-server.com/project/6165d8edd4574600848adecc
Expected Behaviour
Project should load without interruptions or significant delay, when using the reverse proxy.
Observed Behaviour
Loading any project hangs for about 20s showing
Then, all of a sudden, that the project continues loading normally and everything seems to work fine.
Via 127.0.0.1:8080 directly, the project loads immediately not having any delays.
Technical Info
The virtual host config file looks like this:
<VirtualHost *:443>
ServerName overleaf.my-own-server.com
ProxyRequests off
ProxyPass / http://localhost:8080/
ProxyPassReverse / http://localhost:8080/
SSLCertificateFile /path/to/fullchain.pem
SSLCertificateKeyFile /path/to/privkey.pem
</VirtualHost>
Analysis
The delay happens between loading
wss://overleaf.my-own-server.com/socket.io/1/websocket/a8xcva-aOsA4d_AE1r_v
and
https://overleaf.my-own-server.com/socket.io/1/xhr-polling/a8xcva-aOsA4d_AE1r_v?t=1634110147712
Apart from that, the DOM loading cascade shows no abnormalities (no other return codes than 200 and 206)
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