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#include <ESP8266WebServer.h>
ESP8266WebServer server(80);
const char* ssid = "UserName";
const char* password = "12345678";
String HtmlOpen = "<html><body>", HtmlIsi, HtmlClose = "</body></html>";

void setup() {
  // put your setup code here, to run once:
  WiFi.softAP(ssid, password);

  HtmlIsi += "<div align='center'>";
  HtmlIsi += "<form action='/respon' method='post'>";
  HtmlIsi += "<input type='text' name='text'></br>";
  HtmlIsi += "<input type='submit' name='submit' value='Simpan'>";
  HtmlIsi += "</form>";
  HtmlIsi += "</div>";

  server.on("/", handleRoot);
  server.on("/respon", respon);
  server.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  server.handleClient();
}

void respon(){
  String string = server.arg("text");
  String htmlRes;
  htmlRes += HtmlOpen;
  htmlRes += string;
  htmlRes += HtmlClose;
  server.send(200, "text/html", htmlRes);
}

void handleRoot(){response();}

void response(){
  String htmlRes;
  htmlRes += HtmlOpen;
  htmlRes += HtmlIsi;
  htmlRes += HtmlClose;
  server.send(200, "text/html", htmlRes);
}