curl --request GET \
  --url https://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}

import requests

url = "https://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}"

response = requests.get(url)

print(response.text)

const options = {method: 'GET'};

fetch('https://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}', 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://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}"

	req, _ := http.NewRequest("GET", url, nil)

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://mainnet.mirrornode.hedera.com/api/v1/topics/{topicId}/messages/{sequenceNumber}")

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

request = Net::HTTP::Get.new(url)

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

{
  "chunk_info": {
    "initial_transaction_id": "0.0.10-1234567890-000000321",
    "nonce": 3,
    "number": 1,
    "total": 2,
    "scheduled": true
  },
  "consensus_timestamp": "1234567890.000000001",
  "message": "bWVzc2FnZQ==",
  "payer_account_id": "0.0.10",
  "running_hash": "cnVubmluZ19oYXNo",
  "running_hash_version": 2,
  "sequence_number": 1,
  "topic_id": "0.0.7"
}

{
  "_status": {
    "messages": [
      {
        "message": "Invalid parameter: account.id"
      },
      {
        "message": "Invalid Transaction id. Please use \\shard.realm.num-sss-nnn\\ format where sss are seconds and nnn are nanoseconds"
      }
    ]
  }
}

{
  "_status": {
    "messages": [
      {
        "message": "Not found"
      }
    ]
  }
}