ESP32 Problem mit WiFiClientSecure

#include <Arduino.h>

#include <WiFi.h>

#include <WiFiClientSecure.h>

#include <HTTPClient.h> 

const char* ssid = "mySSID";

const char* password = "myPassword";

const char* server = "www.howsmyssl.com";  

WiFiClientSecure client;

void setup() {

  Serial.begin(115200);

  delay(100);

  WiFi.begin(ssid, password);

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

    Serial.print(".");

    delay(1000);

  }

  Serial.print("Connected to ");

  Serial.println(ssid);

}

void anfrage() {

  client.setInsecure(); // Kein Zertifikat verwenden

  if (!client.connect(server, 443))

    Serial.println("Connection failed!");

  else {

    Serial.println("Connected to server!");

    client.println("GET https://www.howsmyssl.com/a/check HTTP/1.0");

    client.println("Host: www.howsmyssl.com");

    client.println("Connection: close");

    client.println();

    while (client.connected()) {

      String line = client.readStringUntil('\n');

      if (line == "\r") {

        Serial.println("headers received");

        break;

      }

    }

    while (client.available()) {

      char c = client.read();

      Serial.write(c);

    }

    client.stop();

  }

}

void loop() {

  static char inChar[2] {0, 0};

  static char inputString[20];            

  if (Serial.available()) { 

    inChar[0] = (char)Serial.read();

    if ((inChar[0] == '\r') || (inChar[0] == '\n')) {

      if (strcmp(inputString, "a") == 0) {

        Serial.println(F("Anfrage senden"));

        anfrage();

      }

      Serial.println();

      inputString[0] = 0;

    } else {

      if (strlen(inputString) < 19) strcat(inputString, inChar);

    }

  }

}