Arduino.ru

      client.println("POST api/v1/okGateReader/inductionLoop HTTP/1.1");
      client.println("Host: https://crm.internal.***.ru");
      client.println("User-Agent: Arduino/1.0");
      client.print("token=");
      client.print("123456");
      client.println("Connection: close");
      client.println();

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

int switchPin = 8;
int m = 8;

// MAC-адрес:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xEA };

EthernetClient client;

void setup()
{
//  Serial.begin(115200);
  Serial.begin(9600);
  Serial.println("Starting...");

// Ethernet.begin(mac);
  
//  pinMode(switchPin, INPUT);

  // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
  }else{
    Serial.print("IP: ");
    Serial.println(Ethernet.localIP());
  }

    char server[] = "crm.internal.***.com"; 
    if (client.connect(server, 443)) {
      Serial.println("connected");
      // Make a HTTP request:
//      String query = "POST api/v1/okGateReader/inductionLoop HTTP/1.1";
//      client.println(query);
      client.println("POST api/v1/okGateReader/inductionLoop HTTP/1.1");
      client.println("Host: https://crm.internal.***.com");
      client.println("User-Agent: Arduino/1.0");
      client.print("token=");
      client.print("12345");
      client.println("Connection: close");
      client.println();
      Serial.println("запрос отправлен");
    }
    else {
      Serial.println("port 443 connection failed");
    }
   
  }
// }

void loop() {
  // put your main code here, to run repeatedly:

}