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Is it possible to proxy external images not to get warnings about insecure content through http link images from external sites?
YES
https://community.nodebb.org/topic/7927/install-camo-for-nodebb-plugin-iframely
https://community.nodebb.org/topic/8220/connection-not-secure
https://community.nodebb.org/topic/8242/solutions-and-ideas-for-insecure-images
Let's limit discussion to those topics