Thanks for your support.
Its my first webserver project, so I do not have a lot of experience with this so I took a existing project.
Now I solved it
In the 8266 coder there was a clinet.flush() command. With removing it on ESP3 the server runs

Hello,
I try to port an Arduino code form ESP8266 to ESP32 ( Wifi Kit 32)
I changed the relavant server includes form
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

to
#include <WiFi.h>
#include <HTTPClient.h>
#include <WiFiClient.h ...