curl --request POST \
  --url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "debug_getRawHeader",
  "params": [
    "0x34808ff"
  ]
}
'

import requests

url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"

payload = {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "debug_getRawHeader",
    "params": ["0x34808ff"]
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({id: 1, jsonrpc: '2.0', method: 'debug_getRawHeader', params: ['0x34808ff']})
};

fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', 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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
  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([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'debug_getRawHeader',
    'params' => [
        '0x34808ff'
    ]
  ]),
  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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"

	payload := strings.NewReader("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"debug_getRawHeader\",\n  \"params\": [\n    \"0x34808ff\"\n  ]\n}")

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

	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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"debug_getRawHeader\",\n  \"params\": [\n    \"0x34808ff\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"debug_getRawHeader\",\n  \"params\": [\n    \"0x34808ff\"\n  ]\n}"

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "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"
}