curl --request POST \
  --url https://api.ck-itsolutions.nl/v1/firewall/rule \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "dst": "<string>",
  "protocol": "<string>",
  "action": "<string>",
  "priority": 123,
  "descr": "<string>",
  "src": {
    "start": "<string>",
    "end": "<string>"
  },
  "port": {
    "src": {
      "start": 123,
      "end": 123
    },
    "dst": {
      "start": 123,
      "end": 123
    }
  },
  "disabled": true,
  "tcpflags": "<array>",
  "ratelimit": 123,
  "packetlength": 123,
  "packettype": 123,
  "statetype": "<string>"
}
'

import requests

url = "https://api.ck-itsolutions.nl/v1/firewall/rule"

payload = {
    "dst": "<string>",
    "protocol": "<string>",
    "action": "<string>",
    "priority": 123,
    "descr": "<string>",
    "src": {
        "start": "<string>",
        "end": "<string>"
    },
    "port": {
        "src": {
            "start": 123,
            "end": 123
        },
        "dst": {
            "start": 123,
            "end": 123
        }
    },
    "disabled": True,
    "tcpflags": "<array>",
    "ratelimit": 123,
    "packetlength": 123,
    "packettype": 123,
    "statetype": "<string>"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    dst: '<string>',
    protocol: '<string>',
    action: '<string>',
    priority: 123,
    descr: '<string>',
    src: {start: '<string>', end: '<string>'},
    port: {src: {start: 123, end: 123}, dst: {start: 123, end: 123}},
    disabled: true,
    tcpflags: '<array>',
    ratelimit: 123,
    packetlength: 123,
    packettype: 123,
    statetype: '<string>'
  })
};

fetch('https://api.ck-itsolutions.nl/v1/firewall/rule', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.ck-itsolutions.nl/v1/firewall/rule",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'dst' => '<string>',
    'protocol' => '<string>',
    'action' => '<string>',
    'priority' => 123,
    'descr' => '<string>',
    'src' => [
        'start' => '<string>',
        'end' => '<string>'
    ],
    'port' => [
        'src' => [
                'start' => 123,
                'end' => 123
        ],
        'dst' => [
                'start' => 123,
                'end' => 123
        ]
    ],
    'disabled' => true,
    'tcpflags' => '<array>',
    'ratelimit' => 123,
    'packetlength' => 123,
    'packettype' => 123,
    'statetype' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.ck-itsolutions.nl/v1/firewall/rule"

	payload := strings.NewReader("{\n  \"dst\": \"<string>\",\n  \"protocol\": \"<string>\",\n  \"action\": \"<string>\",\n  \"priority\": 123,\n  \"descr\": \"<string>\",\n  \"src\": {\n    \"start\": \"<string>\",\n    \"end\": \"<string>\"\n  },\n  \"port\": {\n    \"src\": {\n      \"start\": 123,\n      \"end\": 123\n    },\n    \"dst\": {\n      \"start\": 123,\n      \"end\": 123\n    }\n  },\n  \"disabled\": true,\n  \"tcpflags\": \"<array>\",\n  \"ratelimit\": 123,\n  \"packetlength\": 123,\n  \"packettype\": 123,\n  \"statetype\": \"<string>\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.ck-itsolutions.nl/v1/firewall/rule")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"dst\": \"<string>\",\n  \"protocol\": \"<string>\",\n  \"action\": \"<string>\",\n  \"priority\": 123,\n  \"descr\": \"<string>\",\n  \"src\": {\n    \"start\": \"<string>\",\n    \"end\": \"<string>\"\n  },\n  \"port\": {\n    \"src\": {\n      \"start\": 123,\n      \"end\": 123\n    },\n    \"dst\": {\n      \"start\": 123,\n      \"end\": 123\n    }\n  },\n  \"disabled\": true,\n  \"tcpflags\": \"<array>\",\n  \"ratelimit\": 123,\n  \"packetlength\": 123,\n  \"packettype\": 123,\n  \"statetype\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.ck-itsolutions.nl/v1/firewall/rule")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"dst\": \"<string>\",\n  \"protocol\": \"<string>\",\n  \"action\": \"<string>\",\n  \"priority\": 123,\n  \"descr\": \"<string>\",\n  \"src\": {\n    \"start\": \"<string>\",\n    \"end\": \"<string>\"\n  },\n  \"port\": {\n    \"src\": {\n      \"start\": 123,\n      \"end\": 123\n    },\n    \"dst\": {\n      \"start\": 123,\n      \"end\": 123\n    }\n  },\n  \"disabled\": true,\n  \"tcpflags\": \"<array>\",\n  \"ratelimit\": 123,\n  \"packetlength\": 123,\n  \"packettype\": 123,\n  \"statetype\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

{}

{
  "message": "<string>"
}