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Block on TLS

Inspects the incoming request's TLS version and blocks if under TLSv1.2.

async function handleRequest(request) {
try {
const tlsVersion = request.cf.tlsVersion
// Allow only TLS versions 1.2 and 1.3
if (tlsVersion != "TLSv1.2" && tlsVersion != "TLSv1.3") {
return new Response("Please use TLS version 1.2 or higher.", {
status: 403,
})
}
return fetch(request)
}
catch (err) {
console.error(
"request.cf does not exist in the previewer, only in production",
)
return new Response("Error in workers script" + err.message, {
status: 500,
})
}
}
addEventListener("fetch", event => {
event.respondWith(handleRequest(event.request))
})