snapdrop instance behind Apache Proxy: How to implement X-Forwarded-For

[Tone866]

I'm trying to run snapdrop behind a apache reverse proxy.
Everything works, except that I can see every hosts instead only that one in my network.
I don't know how I can implement the X-Forwarded-For part with apache.
I googled a bit but nothing works.
Can anyone help?

This is my current config:

RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /snapdrop/(.*) ws://localhost:8080/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule /snapdrop/(.*) http://localhost:8080/$1 [P,L]

ProxyPass               /snapdrop/     http://localhost:8080/
ProxyPassReverse        /snapdrop/     http://localhost:8080/
ProxyPass               /snapdrop/     ws://localhost:8080/

<Proxy https://localhost:8080/>
    AllowOverride None
    Order allow,deny
    Allow from all
</Proxy>

[mwy001]

The issue is related to the linuxserver/docker-snapdrop's default nginx config, which will resolve all clients' IP to the IP address of reverse proxy , check this:
linuxserver/docker-snapdrop@d07b0fc#diff-b798d7ad17e8cc7e11749264de70d9201e8767881b0df5980369a5e2edc6f804