画像ファイルのリクエスト

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class APIExamCaptchaNkey {

    public static void main(String[] args) {
        String clientId = "YOUR_CLIENT_ID";//アプリケーションクライアント ID値";
        String clientSecret = "YOUR_CLIENT_SECRET";//アプリケーションクライアントのシークレット値";
        try {
            String code = "0"; // 画像ファイルリクエスト時は0、キャプチャ画像照合時は1に設定
            String apiURL = "https://naveropenapi.apigw.ntruss.com/captcha/v1/nkey?code=" + code;
            URL url = new URL(apiURL);
            HttpURLConnection con = (HttpURLConnection)url.openConnection();
            con.setRequestMethod("GET");
            con.setRequestProperty("X-NCP-APIGW-API-KEY-ID", clientId);
            con.setRequestProperty("X-NCP-APIGW-API-KEY", clientSecret);
            int responseCode = con.getResponseCode();
            BufferedReader br;
            if(responseCode==200) { // 正常な呼び出し
                br = new BufferedReader(new InputStreamReader(con.getInputStream()));
            } else {  // エラー発生
                br = new BufferedReader(new InputStreamReader(con.getErrorStream()));
            }
            String inputLine;
            StringBuffer response = new StringBuffer();
            while ((inputLine = br.readLine()) != null) {
                response.append(inputLine);
            }
            br.close();
            System.out.println(response.toString());
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

import os
import sys
import urllib.request
client_id = "YOUR_CLIENT_ID"
key = "YOUR_CAPTCHA_KEY" # キャプチャ Keyの値
url = "https://naveropenapi.apigw.ntruss.com/captcha-bin/v1/ncaptcha?key=" + key + "&X-NCP-APIGW-API-KEY-ID=" + client_id;
request = urllib.request.Request(url)
response = urllib.request.urlopen(request)
rescode = response.getcode()
if(rescode==200):
    print("キャプチャ画像を保存")
    response_body = response.read()
    with open('captcha.jpg', 'wb') as f:
        f.write(response_body)
else:
    print("Error Code:" + rescode)

<?php
  $client_id = "YOUR_CLIENT_ID";
  $key = "CAPTCHA_KEY";
  $url = "https://naveropenapi.apigw.ntruss.com/captcha-bin/v1/ncaptcha?key=".$key."&X-NCP-APIGW-API-KEY-ID=".$client_id;
  $is_post = false;
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_POST, $is_post);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $response = curl_exec ($ch);
  $status_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  echo "status_code:".$status_code."<br />";
  curl_close ($ch);
  if($status_code == 200) {
    //echo $response;
    $fp = fopen("captcha.jpg", "w+");
    fwrite($fp, $response);
    fclose($fp);
    echo "<img src='captcha.jpg'>";
  } else {
    echo "エラー内容: ".$response;
  }
?>

var express = require('express');
var app = express();
var client_id = 'YOUR_CLIENT_ID';
var fs = require('fs');
app.get('/captcha/image', function (req, res) {
   var api_url = 'https://naveropenapi.apigw.ntruss.com/captcha-bin/v1/ncaptcha?key=' + req.query.key + "&X-NCP-APIGW-API-KEY-ID=" + client_id;
   var request = require('request');
   var options = {
       url: api_url
    };
    var writeStream = fs.createWriteStream('./captcha.jpg');
    var _req = request.get(options).on('response', function(response) {
       console.log(response.statusCode) // 200
       console.log(response.headers['content-type'])
    });
  _req.pipe(writeStream); // fileで出力
  _req.pipe(res); // ブラウザで出力
 });
 app.listen(3000, function () {
   console.log('http://127.0.0.1:3000/captcha/image?key=캡차키 app listening on port 3000!');
 });

using System;
using System.Net;
using System.Text;
using System.IO;

namespace NaverAPI_Guide
{
    public class APIExamCaptchaImage
    {
        static void Main(string[] args)
        {
            string key = "KEY-INPUT"; // https://naveropenapi.apigw.ntruss.com/captcha/v1/nkeyの呼び出しで取得したキー
            string url = "https://naveropenapi.apigw.ntruss.com/captcha/v1/ncaptcha?key=" + key + "&X-NCP-APIGW-API-KEY-ID=YOUR-CLIENT-ID";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string status = response.StatusCode.ToString();
            Console.WriteLine("status="+ status);
            using (Stream output = File.OpenWrite("c:/captcha.jpg"))
            using (Stream input = response.GetResponseStream())
            {
                input.CopyTo(output);
            }
            Console.WriteLine("c:/captcha.jpg was created");
        }
    }
}