speedsmart ping

fetch("http://speedsmart.net/resources/serversJSON.php").then(function(r){return r.json()}).then(function(d){
var sl=d.serverList.reverse(),i=0,l=sl.length;
sl=sl.filter(function(a){return a.serverID!="31" && a.serverID!="32" });l=sl.length-1;
function ping(_s) {
   // console.log(_s);
   var t1=new Date();
   fetch(_s.ping_url, {method: 'HEAD', redirect: 'follow',mode:'no-cors', cache:'no-cache' }).then(function(r){if (r.ok) { return r.text()} else {return 'failed'}}).then(function(d){
   console.log([i,new Date()-t1,_s.serverName, _s.ping_url.split('/')[2],_s.distance].join("\t"));
   if (i<l) {i++;ping(sl[i])  }
   }).catch(function(err) {
    console.log(i,_s.serverName,'failed: '+ err,_s.serverID);
    // console.log(err);
    if (i<l) {i++;ping(sl[i])}
  })




}
ping(sl[i]);

})

// http://speedsmart.net/resources/startupJSON.php  user_isp user_address closestServer