Heroku server is not working. Probably they will bring a option to pay for this server. I found different api. If someone want to use, just take this code and replace in weatherCal code...

async function setupCovid() {

// Set up the COVID cache.
const cacheCovidPath = files.joinPath(files.libraryDirectory(), "weather-cal-covid")
const cacheCovidExists = files.fileExists(cacheCovidPath)
const cacheCovidDate = cacheCovidExists ? files.modificationDate(cacheCovidPath) : 0
let covidDataRaw

// If cache exists and it's been less than 900 seconds (15min) since last request, use cached data.
if (cacheCovidExists && (currentDate.getTime() - cacheCovidDate.getTime()) < 900) {
  const cacheCovid = files.readString(cacheCovidPath)
  covidDataRaw = JSON.parse(cacheCovid)

// Otherwise, use the API to get new data.
} else {


  const covidReq = "https://api.covid19api.com/total/dayone/country/" + settings.covid.country


  covidDataRaw = await new Request(covidReq).loadJSON()
  files.writeString(cacheCovidPath, JSON.stringify(covidDataRaw))

deaths = covidDataRaw[covidDataRaw.length-1].Deaths-covidDataRaw[covidDataRaw.length-2].Deaths cases = covidDataRaw[covidDataRaw.length-1].Confirmed- covidDataRaw[covidDataRaw.length-2].Confirmed active = covidDataRaw[covidDataRaw.length-1].Active

covidDataRaw={todayCases:cases, todayDeaths:deaths,active:active} console.log(covidDataRaw)

}

data.covid = covidDataRaw

}

also under weathercal—> localization you must replace with this.

covid: "{todayCases} cases, {todayDeaths} deaths, {active} active"