This plugin proxies all images via built-in secure proxy.
It's incompatible with af_proxy_http.
Git clone to plugins.local/https_proxy.
Example:
cd ttrss folder
cd plugins.local
git clone https://github.com/timendum/ttrss_https_proxy.git https_proxy
The folder must be named "https_proxy", otherwise the plugin will not appear.
Then enable the plugin in the preferences.
Based on af_proxy_http standard TTRSS plugin, by fox.
I added a customizable whitelist of sites that will not need the proxy and removed "Enable proxy for all" preference.