I'm having a similar issue, except we're using IIS url rewriting to offload the request to mattermost. I actually wrote a VERY simplistic changeset for mattermost to allow the specification of a "ProxyUrl" which is used to override the actual URL for situations like these. In my case, it's not just a matter of HTTP to HTTPS, our hostnames and ports differ as well. The changeset worked beautifully for us, but it'd be great to know if there's something OOTB that could work!
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