curl --request GET \
  --url https://api.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id} \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id}"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id}', 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.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($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://api.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id}"

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id}")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.utage-system.com/v1/accounts/{account_id}/line/friends/{friend_id}")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "data": {
    "id": "<string>",
    "common_friend_id": "<string>",
    "common_reader_id": "<string>",
    "display_name": "<string>",
    "picture_url": "<string>",
    "is_blocked": true,
    "is_test_account": true,
    "is_exclusion": true,
    "response_status": {
      "text": "<string>",
      "color": "<string>"
    },
    "labels": [
      {
        "id": "<string>",
        "name": "<string>"
      }
    ],
    "common_fields": {},
    "memo": "<string>",
    "message_tracking_name": "<string>",
    "last_acted_at": "<string>",
    "created_at": "<string>"
  }
}

{
  "error": {
    "code": "unauthorized",
    "message": "認証に失敗しました"
  }
}

{
  "error": {
    "code": "not_found",
    "message": "リソースが見つかりません"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "リクエスト上限を超えました。しばらく時間を空けて再試行してください"
  }
}