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

async function handleRequest(request) {
  const init = {
    headers: {
    'content-type':'text/html;charset=UTF-8',
    },
  }
  return new Response( my_html, init )
}
const my_html= `
<!DOCTYPE html>
<html>
<body>
Hello Low End World!!!
</body>
</html>
`