Web page LED switch

#include <WiFi.h>
#include <WebServer.h>

const char* WIFI_NAME = "your-network";
const char* WIFI_PASS = "your-password";
const int LED = 2;

WebServer server(80);
bool on = false;

void page() {
  String h = "<!doctype html><meta name=viewport content='width=device-width'>";
  h += "<h1>LED is ";
  h += on ? "on" : "off";
  h += "</h1><a href='/toggle'>Toggle</a>";
  server.send(200, "text/html", h);
}

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  WiFi.begin(WIFI_NAME, WIFI_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(300);
    Serial.print(".");
  }
  Serial.printf("\nOpen http://%s\n", WiFi.localIP().toString().c_str());

  server.on("/", page);
  server.on("/toggle", []() {
    on = !on;
    digitalWrite(LED, on);
    server.sendHeader("Location", "/");
    server.send(303);
  });
  server.begin();
}

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