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Troubleshooting

UI5 Server

Chrome redirects HTTP URLs to HTTPS (ERR_SSL_PROTOCOL_ERROR)

An HTTPS server or proxy that was previously running on a domain (e.g. localhost), might have set an HSTS header, enforcing Chrome to always use HTTPS for this domain. See https://www.chromium.org/hsts. This makes it impossible to connect to an HTTP-only server running on the same domain.

Resolution

You need to delete the HSTS mapping in chrome://net-internals/#hsts by entering the domain name (e.g. localhost) and pressing "delete".

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