Document: when using reverse proxy, connection security shouldn't be set to TLS

[jasonblais]

It seems that if you’re using a reverse proxy - the Mattermost console option for Connection Security within Web Server settings must be set to None. Even though Use Let's Encrypt is set to false, somehow it seems Mattermost still thinks this option is enabled if Connection Security is set to TLS instead of None.

See more details at https://forum.mattermost.org/t/apache-client-sent-an-http-request-to-an-https-server/7763

[justinegeffen]

If you're interested in taking on this documentation request, let us know by commenting on the issue. The documentation that may be affected by this issue is: https://docs.mattermost.com/install/config-apache2.html. The submitter of this issue may have additional links and content available.

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