esp-32 showing post method

#include <WiFi.h>
#include "DHT.h"
#include <HTTPClient.h>
#define DHTPIN 32
const char* ssid = "PTCL-BB1";
const char* password = "shoaibmectec";
const char* host = "http://jsonplaceholder.typicode.com/posts"; //edit the host adress, ip address etc.
String url = "/post/"; int adcvalue = 0;
float t;
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
void setup()
{

  dht.begin();
  Serial.begin(115200);
  delay(10); // We start by connecting to a WiFi network
  Serial.println();
  Serial.println(); Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
int value = 0;
void loop()
{
  getSensorValues();   //susbstitute adc value
  Serial.print("connecting to ");
  Serial.println(host); // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort))
  {
    Serial.println("connection failed");
    return;
  }
  Serial.print("Requesting URL: ");
  Serial.println(url); //Post Data
  String postData = "temp=" + String(t);
  String address = host + url;
  HTTPClient http;
  http.begin(address);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  auto httpCode = http.POST(postData);
  Serial.println(httpCode); //Print HTTP return code
  String payload = http.getString();
  Serial.println(payload); //Print request response payload
  http.end(); //Close connection Serial.println();
  Serial.println("closing connection");
  delay(5000);

}
void getSensorValues() {
  float h = dht.readHumidity();
  t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!")); //print to server
    return;
  }
}