Starting with version 1.4 TinyPortal is ready to fully use the SMF image proxy for using secure https traffic. The image proxy is available in core SMF from release 2.0.14.
With this functionality TinyPortal will also serve images in articles and blocks over https when needed.
By default TinyPortal will follow the settings you are making in your SMF forum: see SMF support portal for the details on moving your forum to HTTPS.
The SMF image proxy will serve any content on your forum that is linked to non-secure HTTP locations via a 'proxy' in your server. If an image is in a HTTP location, the proxy downloads a copy of the image to your server, caches it, and serves this copy to visitors over SSL. Once you activate the Image proxy in the SMF settings, all images in TinyPortal articles and blocks will be handled by the image proxy as well: secure content is immediately served to visitors, content from insecure sources will be cached.
Even though it is not necessary, it is recommended to review articles and block content to serve images as much as possible from https locations: this will decrease the amount of storage required on your server (HTTPS images will not be cached) and also the amount of traffic. Wherever images are served from http:// locations, check if this can be updated to https://....
Perform the final image proxy check? There is one setting in TinyPortal that has effect on the Image Proxy handling (see the screenshot below). This setting relates to a function in TP to apply the Image Proxy in PHP articles and HTML blocks. In some rare situations this proxy check has conflicted with another MOD: this switch allows you to deactivate this check in TinyPortal in case it causes an issue with a MOD in your forum.
Without this function all other content in TinyPortal will still be served over the Image proxy: you can still maintain a fully secure website if you make sure that all images in PHP blocks and HTML articles are served via https:// links.