Help setting SSL between internet and Apache, but plain HTTP between Apache and CODE?

Hi all,

        I have set up CODE based on docker, and I am trying to achieve the following: have 
connections through internet use SSL/TLS to Apache, while Apache uses plain HTTP to communicate 
with Docker. Does anybody know if this is doable? I have been playing with the options (I have 
already SSL enabled for other sites, so I want to keep the same configuration, certificates, etc.) 
for SSL and SSLproxy, while either disabling SSL in the Docker container or leaving it enabled 
while setting the "terminal" parameter to "true"... all of them unsuccessfully.

        Furthermore: does make sense what I am trying to accomplish? I understand that there is no 
need to have SSL between the Apache and Docker, because they are in the same machine, while Apache 
enforces SSL on the connections from the internet to keep the data secure. When I do this, what I 
get in Firefox (when accessing any document in nextcloud) is a Content Security Policy error that 
refers to the plain text URL (http) although I have set up in nextcloud to use the SSL enabled URL 
(https), as I am enabling SSL on Apache itself.

        Thank you all!
        Felix