Your apps should use only HTTPS - especially if there is any kind of authentication involved on your front-end.
Not only can HTTP traffic be captured and read by anyone with access to your network, increasingly web services and technologies are starting to force people to use HTTPS;
Progressive Web Apps - an awesome new feature that lets users install your website as an app - requires HTTPS and certain top level domains (TLDs) such as .dev require that HTTPS be enabled for any domains with that TLD.
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