addEventListener('fetch', event => {
    event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
    let tlsCipher = (request.cf || {}).tlsCipher
    const blockCiphers = ['ECDHE_ECDSA_WITH_AES_128_CBC_SHA', 'ECDHE_ECDSA_WITH_AES_256_CBC_SHA', 'ECDHE_ECDSA_WITH_AES_128_CBC_SHA256', 'ECDHE_ECDSA_WITH_AES_256_CBC_SHA384']
    if (blockCiphers.includes(tlsCipher)) {
        return new Response("Please use a more secure Browser", {
            status: 403,
            statusText: "Forbidden"
        })
    }
    const response = await fetch(request)
    return response
}