Arduino Nano web server with w5500

/*
 https://docs.arduino.cc/tutorials/ethernet-shield-rev2/WebServer
  Web Server
ARDUINO NANO
A5 SCL Yellow
A4 SDA Green
D10 CS SPI
D11 MOSI SPI
D12 MISO SPI
D13 SCK SPI

ARCELI W5500 SPI
LAN Ethernet Module réseau TCP IP STM32 Interface 3.3V 5V
https://www.amazon.fr/gp/product/B09DYFLMJG/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
GND                           GND
GND                           VCC --> +3V3 arduino nano
MOSI --> D11 arduino nano     VCC --> +3V3 arduino nano
SCK -->  D13 arduino nano     NC
CS  -->  D10 arduino nano     RST
INT                           MISO --> D12 arduino nano
 */

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xEE}; //MAC Address

IPAddress ip(192, 168, 6,69);//IP address

EthernetServer server(80);//PORT 80 http

// Initialize the Ethernet server library


void setup() {
  Ethernet.init(10);  // CS D10(Arduino Nano) -->CS W5500

  Serial.begin(9600); //Serial Debug
  while (!Serial) { } //Wait USB Serial ttyUSB
  Serial.println("Ethernet WebServer");

  Ethernet.begin(mac, ip); //Start Server web

  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet ARCELI W5500  not found.");
    while (true) {
      delay(1); // Bucle No hardware Error
    }
  }else { Serial.println("Ethernet Hardware W5500 OK ");};

  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
  }

  // start the server
  server.begin();
  Serial.print("server IP ");
  Serial.println(Ethernet.localIP());
}


void loop() {
  // listen for incoming clients
  EthernetClient client = server.available();

  if (client) {
    Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply

        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header

          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page  every 5 sec
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
         client.print("ICARO SERVER on ARDUINO NANO WITH w5500 ");
         client.println("<br />");
         client.println("</html>");
         break;

        }

        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        } else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
    Serial.println("client disconnected");
  }
}