WLED JSON API POST Request mit ESP32

{"on":false,"bri":128,"transition":7,"ps":-1,"pl":-1,"ccnf":{"min":1,"max":5,"time":12},"nl":{"on":false,"dur":60,"fade":true,"mode":1,"tbri":0,"rem":-1},"udpn":{"send":false,"recv":true},"lor":0,"mainseg":0,"seg":[{"id":0,"start":0,"stop":150,"len":150,"grp":1,"spc":0,"on":true,"bri":255,"col":[[255,0,1,0],[0,0,0,0],[0,0,0,0]],"fx":0,"sx":128,"ix":128,"pal":0,"sel":false,"rev":false,"mi":false}]}

#include <WiFi.h>

#include <HTTPClient.h>

#include "OneButton.h"

const char* ssid = "SSID";

const char* password =  "PW";

//Button setup 

 OneButton buttonSegment1(2, true);

void setup() {

  Serial.begin(115200);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    Serial.println("Connecting to WiFi..");

  }

  Serial.println("Connected to the WiFi network");

  buttonSegment1.attachClick(buttonSegment1click);

}

void loop() {

 buttonSegment1.tick();

} 

void buttonSegment1click() {

  Serial.println("buttonSegment1 click.");

  HTTPClient http;

  http.begin("http://wledIP/json/state");

  http.addHeader("Content-Type", "applictaion/json");

  int httpResponseCode = http.POST("{\"on\":\"true\"}"); // JSON Value "on" auf "true" umändern. 

  //Antwort von WLED abwarten...

  if (httpResponseCode > 0) {

    String payload = http.getString();

    Serial.println("Statuscode: " + String(httpResponseCode));

    Serial.println(payload);

  }

  else {

      Serial.println("Error on HTTP Json request");

    }

    http.end();

}