How to set up a mobile webserver with reverse SSH and a reverse proxy? - ssh

Question

I’m trying to host an apache webserver on a phone with termux, and the final goal is to make this server mobile by using 4G.To achieve this I thought it was possible to use a reverse SSH connection (to set a connection from the phone, wherever he is on internet) to a proxy in my home. The DNS of my website will redirect to this (reverse) proxy, which will redirect to my phone webserver, by using the reverse SSH connection.
For now, the phone server is on the same wifi network as the proxy, not in 4G.
So this phone connects to a computer which acts as a proxy, by connecting with reverse SSH on port 8082. From this computer, when I search http://localhost:8082 on internet on the computer, it works, I have access to the website.
However I can’t access the website from another device on the local network or from internet (I tried http://IPproxyComputer:8082 and I tried from a device on internet http://MyPublicIP with a port redirection from 80 to IPproxyComputer :8082 on my router). I don’t have any firewall on.
Here is a diagram to clarify
I didn’t find anyone trying to host a webserver with this config but someone explain how to give access to a device with reverse SSH and a squid proxy here.
So I thought this is what I must do, but with a different configuration for Squid because in my case, the request comes from someone on internet or local network to the webserver, so Squid must listen on a port, let say 8081 and redirect to 8082 where the SSH connection is, but I failed to set this up.
I need help to undersand two things:
-Why is the page accessible from the proxy with http://localhost:8082, but not from a device on the local network with http://IpproxyComputer:8082 ? Is it because of an authorization (and is it possible to change it?). Or is it just impossible to do this kind of connection ?
Is it a solution to use squid ? How to set this up ?
Here is the reverse SSH command I used from the phone webserver :
ssh -R 8080:localhost:8081 UsrProxyComputer#IPproxyComputer
Here is the config I tried for squid (it is the first time I use it and I am really a beginner in networks)
Define the listening port and default site
# Declare that virtual hosts will be used for allowing the reverse proxy
http_port 8081 accel vhost
# First we will configure the servers in our system
cache_peer 127.0.0.1 parent 8082 0 proxy-only name=InterRedir
# Create an additional ACL for local network access
acl localip src 192.168.0.0/24
http_access allow localip
cache_peer_access InterRedir allow localip
# Next we will map domains to the specific systems
# 1) This is done by creating an ACL for the domain
# 2) Then granting http access to it to allow the connection
# to get through.
# 3) Then mapping an acl to the specific server
# MyWebSite.com
acl MyWebSite_acl dstdomain MyWebSite.Com
http_access allow MyWebSite_acl
cache_peer_access InterRedir allow MyWebSite_acl
# Additional ACL definitions
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
acl purge method PURGE
acl CONNECT method CONNECT
# Restrictions
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny all
# Disable caching
cache deny all