esp-32 post sensor data to esp server

#include <WebServer.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Arduino.h>
#include <WiFi.h>
#include "DHT.h"
const char* ssid = "PTCL-BB1";
const char* password = "shoaibmectec";
#define DHTPIN 32
#define oneWireBus  33
#define DHTTYPE DHT22
#define moistPin  35
#define LDRPin  34
OneWire oneWire(oneWireBus);
DallasTemperature sensors(&oneWire);
String postData;
String postVariable = "temp=";
int LDRValue = 0;
int moistVal;
String values;
unsigned long currentMillis;
unsigned long previousMillis;
const int interval = 2500;
DHT dht(DHTPIN, DHTTYPE);
float t, h, moisture, light;
WebServer server(80);

void setup() {
  Serial.begin(115200);
  delay(100);
  sensors.begin();  //starts ds18b20
  dht.begin();   //give 2 second delay to all sensors
  Serial.println("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  //check wi-fi is connected to wi-fi network
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected..!");
  Serial.print("Got IP: ");  Serial.println(WiFi.localIP());

  server.on("/", handle_OnConnect);
  server.onNotFound(handle_NotFound);

  server.begin();
  Serial.println("HTTP server started");

}
void loop() {

  server.handleClient();
}


void handle_OnConnect() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!")); //print to server
    return;
  }
  LDRValue = analogRead(LDRPin); // read the value from the LDR
  light = LDRValue;
  moistVal = analogRead(moistPin);
  moisture = moistVal;
  delay(2000);
  server.send(200, "text/html", SendHTML(t, h, moisture, light));
}

void handle_NotFound() {
  server.send(404, "text/plain", "Not found");
}

String SendHTML(float t, float h, float moisture, float light) {
  String ptr = "<!DOCTYPE html> <html>\n";
  ptr += "<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=no\">\n";
  ptr += "<title>ESP32 Weather Station</title>\n";
  ptr += "<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}\n";
  ptr += "body{margin-top: 50px;} h1 {color: #444444;margin: 50px auto 30px;}\n";
  ptr += "p {font-size: 24px;color: #444444;margin-bottom: 10px;}\n";
  ptr += "</style>\n";
  ptr += "<script>\n";
  ptr += "setInterval(loadDoc,1000);\n";
  ptr += "function loadDoc() {\n";
  ptr += "var xhttp = new XMLHttpRequest();\n";
  ptr += "xhttp.onreadystatechange = function() {\n";
  ptr += "if (this.readyState == 4 && this.status == 200) {\n";
  ptr += "document.body.innerHTML =this.responseText}\n";
  ptr += "};\n";
  ptr += "xhttp.open(\"GET\", \"/\", true);\n";
  ptr += "xhttp.send();\n";
  ptr += "}\n";
  ptr += "</script>\n";
  ptr += "</head>\n";
  ptr += "<body>\n";
  ptr += "<div id=\"webpage\">\n";
  ptr += "<h1>ESP32 Weather Station</h1>\n";
  ptr += "<p>Temperature: ";
  ptr += t;
  ptr += "&deg;C</p>";
  ptr += "<p>Humidity: ";
  ptr += h;
  ptr += "%</p>";
  ptr += "<p>moisture: ";
  ptr += moisture;
  ptr += "</p>";
  ptr += "<p>light: ";
  ptr += light;
  ptr += "</p>";
  ptr += "</div>\n";
  ptr += "</body>\n";
  ptr += "</html>\n";
  return ptr;
}