curl --request POST \
  --url https://api.example.com/admin/api/rules \
  --header 'Content-Type: application/json' \
  --cookie gproxy_session= \
  --data '
{
  "pattern": "<string>",
  "replacement": "<string>",
  "action": null,
  "enabled": null,
  "filterBody": "<unknown>",
  "filterEventPattern": null,
  "filterHeader": "<unknown>",
  "filterHeaderPattern": null,
  "filterModelPattern": null,
  "filterOperationKeys": "<unknown>",
  "id": null,
  "paths": "<unknown>",
  "phase": null,
  "ruleSetId": null,
  "sortOrder": null,
  "target": null,
  "targetName": null
}
'

import requests

url = "https://api.example.com/admin/api/rules"

payload = {
    "pattern": "<string>",
    "replacement": "<string>",
    "action": None,
    "enabled": None,
    "filterBody": "<unknown>",
    "filterEventPattern": None,
    "filterHeader": "<unknown>",
    "filterHeaderPattern": None,
    "filterModelPattern": None,
    "filterOperationKeys": "<unknown>",
    "id": None,
    "paths": "<unknown>",
    "phase": None,
    "ruleSetId": None,
    "sortOrder": None,
    "target": None,
    "targetName": None
}
headers = {
    "cookie": "gproxy_session=",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {cookie: 'gproxy_session=', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    pattern: '<string>',
    replacement: '<string>',
    action: null,
    enabled: null,
    filterBody: '<unknown>',
    filterEventPattern: null,
    filterHeader: '<unknown>',
    filterHeaderPattern: null,
    filterModelPattern: null,
    filterOperationKeys: '<unknown>',
    id: null,
    paths: '<unknown>',
    phase: null,
    ruleSetId: null,
    sortOrder: null,
    target: null,
    targetName: null
  })
};

fetch('https://api.example.com/admin/api/rules', 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.example.com/admin/api/rules",
  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([
    'pattern' => '<string>',
    'replacement' => '<string>',
    'action' => null,
    'enabled' => null,
    'filterBody' => '<unknown>',
    'filterEventPattern' => null,
    'filterHeader' => '<unknown>',
    'filterHeaderPattern' => null,
    'filterModelPattern' => null,
    'filterOperationKeys' => '<unknown>',
    'id' => null,
    'paths' => '<unknown>',
    'phase' => null,
    'ruleSetId' => null,
    'sortOrder' => null,
    'target' => null,
    'targetName' => null
  ]),
  CURLOPT_COOKIE => "gproxy_session=",
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.example.com/admin/api/rules"

	payload := strings.NewReader("{\n  \"pattern\": \"<string>\",\n  \"replacement\": \"<string>\",\n  \"action\": null,\n  \"enabled\": null,\n  \"filterBody\": \"<unknown>\",\n  \"filterEventPattern\": null,\n  \"filterHeader\": \"<unknown>\",\n  \"filterHeaderPattern\": null,\n  \"filterModelPattern\": null,\n  \"filterOperationKeys\": \"<unknown>\",\n  \"id\": null,\n  \"paths\": \"<unknown>\",\n  \"phase\": null,\n  \"ruleSetId\": null,\n  \"sortOrder\": null,\n  \"target\": null,\n  \"targetName\": null\n}")

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

	req.Header.Add("cookie", "gproxy_session=")
	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.example.com/admin/api/rules")
  .header("cookie", "gproxy_session=")
  .header("Content-Type", "application/json")
  .body("{\n  \"pattern\": \"<string>\",\n  \"replacement\": \"<string>\",\n  \"action\": null,\n  \"enabled\": null,\n  \"filterBody\": \"<unknown>\",\n  \"filterEventPattern\": null,\n  \"filterHeader\": \"<unknown>\",\n  \"filterHeaderPattern\": null,\n  \"filterModelPattern\": null,\n  \"filterOperationKeys\": \"<unknown>\",\n  \"id\": null,\n  \"paths\": \"<unknown>\",\n  \"phase\": null,\n  \"ruleSetId\": null,\n  \"sortOrder\": null,\n  \"target\": null,\n  \"targetName\": null\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/admin/api/rules")

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

request = Net::HTTP::Post.new(url)
request["cookie"] = 'gproxy_session='
request["Content-Type"] = 'application/json'
request.body = "{\n  \"pattern\": \"<string>\",\n  \"replacement\": \"<string>\",\n  \"action\": null,\n  \"enabled\": null,\n  \"filterBody\": \"<unknown>\",\n  \"filterEventPattern\": null,\n  \"filterHeader\": \"<unknown>\",\n  \"filterHeaderPattern\": null,\n  \"filterModelPattern\": null,\n  \"filterOperationKeys\": \"<unknown>\",\n  \"id\": null,\n  \"paths\": \"<unknown>\",\n  \"phase\": null,\n  \"ruleSetId\": null,\n  \"sortOrder\": null,\n  \"target\": null,\n  \"targetName\": null\n}"

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

{
  "action": "replace",
  "createdAtMs": 123,
  "enabled": true,
  "filterBody": "<unknown>",
  "filterEventPattern": "<string>",
  "filterHeader": "<unknown>",
  "filterHeaderPattern": "<string>",
  "filterModelPattern": "<string>",
  "filterOperationKeys": "<unknown>",
  "id": "<string>",
  "paths": "<unknown>",
  "pattern": "<string>",
  "phase": "<string>",
  "replacement": "<string>",
  "ruleSetId": "<string>",
  "sortOrder": 123,
  "target": "<string>",
  "targetName": "<string>",
  "updatedAtMs": 123
}

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}