Wokwi - Online ESP32, STM32, Arduino Simulator

#include "WiFi.h" //Wokwi
//#include <ESP8266WiFi.h> //NodeMCU
#include <WiFiClient.h>
#include "DHT.h" 
#define DHTPIN 2 //D2 //Wokwi
// #define DHTPIN 4 //D2 //NodeMCU
#define DHTTYPE DHT22 
DHT dht (DHTPIN, DHTTYPE);
WiFiServer server (80);

static char celsius [7];
static char fahrenheit[7];
static char humidity[7];

void setup() {
  Serial.begin(9600);
  dht.begin(); 
  WiFi.mode(WIFI_STA);
  WiFi.begin("Wokwi-GUEST", ""); 
  //WiFi.begin("ssid","pw");
  Serial.println("");
  while (WiFi.status() != WL_CONNECTED) { 
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("Name : Darshana Durgamahanty ");
  Serial.println("Roll No : CH.EN.U4CSE20020");
  Serial.print("WiFi connected");
  Serial.print("IP address: "); 
  Serial.println(WiFi.localIP());
  server.begin();
  Serial.println("HTTP server started");
}

void loop() { 
  WiFiClient client = server.available();
  if (client) {
    Serial.println(client.connected()); 
    boolean blank_line = true;
    while (client.connected()) {
      char c= client.read();
      Serial.print(c);
      if (client.available()) {
        if (blank_line) {
          delay(2000); 
          float h = dht.readHumidity();
          float c = dht.readTemperature(); //Celsius
          float f = dht.readTemperature(true); //Fahrenheit
          if (isnan(h) || isnan(c) || isnan(f)) {
            Serial.println("Failed to read from DHT11 sensor!"); 
            strcpy(celsius, "Failed");
            strcpy(fahrenheit, "Failed");
            strcpy(humidity, "Failed");
          }
          else {
            float hif = dht.computeHeatIndex(f, h);
            dtostrf(f, 6, 2, fahrenheit);
            float hic = dht.computeHeatIndex(c, h, false);
            dtostrf(c, 6, 2, celsius);
            dtostrf(h, 6, 2, humidity);
            Serial.print("Humidity: ");
            Serial.print(humidity);
            Serial.print("% Temperature: ");
            Serial.print(celsius);
            Serial.print("°C ");
            Serial.print(fahrenheit);
            Serial.print("°F Heat index: ");
            Serial.print(hic);
            Serial.print("°C ");
            Serial.print(hif);
            Serial.println("F");
          } 
          client.println("HTTP/1.1 200 OK");
          client.println("Content-type: text/html");
          client.println("Connection: close");
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          client.println("<head></head><body><h1>ESP8266 - Temperature and Humidity </h1><h3>Temperature in Celsius: ");
          client.println(celsius);
          client.println("°C </h3><h3>Temperature in Fahrenheit: ");
          client.println(fahrenheit);
          client.println("°F </h3><h3>Humidity: ");
          client.println(humidity);
          break;
        }
        // if(c== '\n'){
        //   blank_line = true;
        // }
        // else if(c != '\r'){
        //   blank_line = false;
        // }
      }
    }
    delay(2);
    client.stop();
    Serial.println("Client disconnected");
  }
}