Url parse error in playground

I’m getting an error in playground: Unable to parse URL: ​https://developers.cloudflare.com/workers/about/

Can anyone tell me why that would happen?

/**
 * Redirect when UA is curl and no cf-redir cookie sent
 * @param {Request} request
 */
async function redirect(request) {
  const userAgent = request.headers.get("User-Agent") || ""
  const curl = userAgent.includes("curl")
  const cookie = request.headers.get("Cookie") || ""
  const bypass = cookie.includes("cf-noredir=true")

  if (curl && !bypass) {
    return Response.redirect("​https://developers.cloudflare.com/workers/about/")
  } else {
    return await fetch(request)      
  }  
}

async function handleRequest(request) {
  return redirect(request)
}

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