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L.mapbox.config.FORCE_HTTPS
By default, this is false. Mapbox.js auto-detects whether the page your map
is embedded in is using HTTPS or SSL, and matches: if you use HTTPS on your site,
it uses HTTPS resources.
Setting FORCE_HTTPS to true makes Mapbox.js always require HTTPS resources,
regardless of the host page's scheme.
Example:
L.mapbox.config.FORCE_HTTPS = true;