ESP8266 DNS du Proxy

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Bonjour
Pour une appli je configure un ESP en proxy avec DNS mais voilà, impossible d'appeler la page html via ce DNS avec le smartphone (wifi connecté) -> vfd.local
alors que par l'ip ça fonctionne.

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>

#define USE_SERIAL Serial

ESP8266WiFiMulti WiFiMulti;

//const char* ssid = "";
//const char* password = "";

//const char* newssid = "";
//const char* newpassword = "";

ESP8266WebServer server(80);

/******************************************************************/

String postForms1 = "<html>\
  <head>\
    <title>ESP8266 onduleur</title>\
    <style>\
    body { background-color: lightblue; font-family: Comic Sans MS, Arial; Color: #000088;text-align: center }\     
    td {text-align: center;}\
    .divbtn { position:absolute; top: 50px; right: 50px;}\
    .btn {width:85px;height:85px;background:#cc0000;font: 18px Comic Sans  MS;border-radius:50%;border:5px;color:#fff;cursor:pointer}\
    .btn:hover{background:#ffffff;color: #cc04c2;}\
    table, th, td {border: 1px solid black; border-collapse: collapse;}\
    #cadre{padding-bottom:19px;padding-left: 1px;position: relative;}\
    .inforp {background-color: grey;color:white;font-family:verdana;width: 30px;position: absolute;}\
    input {width: 2.5em;font-size: 1.5em;}\
    </style>\
  </head>\
  <body onload=\"initVar()\">\
    <h1>Variateur de fr&eacute;quence sinuso&iuml;dal
pour moteur asynchrone monophas&eacute; •</h1>\
  <h2>Modulation &agrave; largeur d'impulsion
&nbsp;
</h2>\
    <form method=\"post\" action=\"\" >\
  <table border=\"border:1px solid black\" width=\"90%\" align=\"center\">\
    <tr>\
      <td colspan=\"3\"><h3>Fr&eacute;quence:</h3></td>\
    </tr>\
    <tr>\
      <td width=\"10%\">\
        <input type=\"button\" value=\"-\" id=\"d2\" onclick=\"decalefreq(a=-1)\" onmouseover = \"myVar=setInterval(delais2, 200);\" onmouseout = \"clearInterval(myVar);\"/>\
      </td>\
      <td id=\"cadre\">\
        <p class=\"inforp\" id=\"freq\">0</p>\
      </td>\
      <td width=\"10%\">\
        <input type=\"button\" value=\"+\" id=\"d1\" onclick=\"decalefreq(a=1)\" onmouseover = \"myVar=setInterval(delais1, 200);\" onmouseout = \"clearInterval(myVar);\"/>\
      </td>\
    </tr>\
    <tr>\
      <td colspan=\"3\">\
        <h3>Temps de d&eacute;marrage:</h3>\
      </td>\
    </tr>\
    <tr>\
      <td>\
        <input type=\"button\" value=\"-\" id=\"d4\" onclick=\"decaleramp(a=-1)\" onmouseover = \"myVar=setInterval(delais4, 300);\" onmouseout = \"clearInterval(myVar);\"/>\
      </td>\
      <td id=\"cadre\">\
        <p class=\"inforp\" id=\"ramp\">0</p>\
      </td>\
      <td>\
        <input type=\"button\" value=\"+\" id=\"d3\" onclick=\"decaleramp(a=1)\" onmouseover = \"myVar=setInterval(delais3, 300);\" onmouseout = \"clearInterval(myVar);\"/>\
      </td>\
    </tr>\
  </table>\
  <h3>• Moteur &agrave; spire de Frager ou &agrave; boucle de d&eacute;phasage<h3/>\
  <div class=\"divbtn\"><input type=\"submit\" class=\"btn\" value=\"Valider\"/></div>\
  <input type=\"hidden\" value=\"";
  
String postForms2 = "\" name=\"frequence\"/>\
  <input type=\"hidden\" value=\"";
  
String postForms3 = "\" name=\"rampe\"/>\
    </form>\
  <script>\
    var y1;\
    var y2;\
    var elmtfreq;\
    var elmtramp;\
    var x = 0;\
    var r = 0;\
    var myVar;\
    function initVar() {\
      y = parseInt(window.innerWidth,10)*0.8;\
      y1 = (y/75);\
      y2 = Math.round(y/6);\
      elmtfreq = document.getElementById('freq');\
      elmtramp = document.getElementById('ramp');\
      a = document.getElementsByName('frequence')[0].value;\
      decalefreq(a);\
      a = document.getElementsByName('rampe')[0].value;\
      decaleramp(a);\
      }\
    function decalefreq() {\
      x += (y1*a);\
      if(x > -1 & x < (y1*61)){elmtfreq.style.left = Math.round(x) + 'px';};\
      x = parseInt(elmtfreq.style.left);\
      document.getElementById('freq').textContent = Math.round(x/y1);\
      document.getElementsByName('frequence')[0].value = Math.round(x/y1);}\
    function decaleramp() {\
      r += (y2*a);\
      if(r > -1 & r < (y2*6)){elmtramp.style.left = r + 'px';};\
      r = parseInt(elmtramp.style.left);\
      document.getElementById('ramp').textContent = r/y2;\
      document.getElementsByName('rampe')[0].value = r/y2;}\
    function delais1(){decalefreq(a=1);}\
    function delais2(){decalefreq(a=-1);}\
    function delais3(){decaleramp(a=1);}\
    function delais4(){decaleramp(a=-1);}\
window.addEventListener('load', function(){\    
var d1 = document.getElementById('d1');\    
var d2 = document.getElementById('d2');\    
var d3 = document.getElementById('d3');\    
var d4 = document.getElementById('d4');\    
var a;\   
d1.addEventListener('touchstart', function(e){a=setInterval(delais1, 200);e.preventDefault()},false);\
d1.addEventListener('touchend', function(e){clearInterval(a);e.preventDefault()}, false);\
d2.addEventListener('touchstart', function(e){a=setInterval(delais2, 200);e.preventDefault()},false);\
d2.addEventListener('touchend', function(e){clearInterval(a);e.preventDefault()}, false);\
d3.addEventListener('touchstart', function(e){a=setInterval(delais3, 300);e.preventDefault()},false);\
d3.addEventListener('touchend', function(e){clearInterval(a);e.preventDefault()}, false);\
d4.addEventListener('touchstart', function(e){a=setInterval(delais4, 300);e.preventDefault()},false);\
d4.addEventListener('touchend', function(e){clearInterval(a);e.preventDefault()}, false);}\
,false)\
  </script>\
  </body>\
</html>";
 
String postForms ;
int frequence = 0;
float rampe = 0;
/**************************************************************** */


/******************************************************************/
void handleRoot()
  {if ( server.hasArg("frequence") )
    {frequence = server.arg("frequence").toInt();
     rampe   = server.arg("rampe").toFloat();}
    
  postForms = postForms1 + String(frequence) + postForms2  + String(rampe) + postForms3 ;
  server.send(200, "text/html", postForms);
}


/***********************************************************/
void setup(void)
{
  Serial.begin(115200);
  for(uint8_t t = 4; t > 0; t--) 
    {USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
     USE_SERIAL.flush();
     delay(1000);}
  
  //WiFi.softAP(newssid, newpassword);

  MDNSResponder mdns;
  mdns.begin ( "vfd", WiFi.localIP () ); 
  if (MDNS.begin("vfd"))
    {Serial.println("MDNS responder started");}
  

  server.on("/", handleRoot);
  MDNS.addService ("http", "tcp", 80);
  //server.onNotFound(handleNotFound);

  server.begin();
  Serial.println("HTTP Server Started");
  
  //WiFiMulti.addAP(ssid, password);
}


/*********************************************************/
void loop(void){
  server.handleClient();
}

Auriez vous une idée
Merci