无法将图片上传到网址位置

Question

我试图将图片文件上传到网址位置。虽然响应状态代码即将到来pagination。但图像没有上传。连接输入流正在200投掷Internal Server Error。下面是我的输出代码：

status=500

输出：

package pack;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
import javax.net.ssl.HttpsURLConnection;
import org.apache.commons.io.FileUtils;

public class TESTTEST {

    /**
     * @param args
     * @throws IOException 
     */

    public void go() throws IOException{
        URL url = new URL("https://mobcsao.com/fwct-provider/api/v1/clients/67/images");
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.addRequestProperty("Authorization", "Basic " +"d3BpdHM6cGFzc3dvcmQ=");
        conn.addRequestProperty("Fineract-Platform-TenantId", "default");
        conn.addRequestProperty("Content-Type", "multipart/form-data");
        conn.setReadTimeout(10000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);
        OutputStream outputStream=conn.getOutputStream();

        FileUtils.copyFile(new File("/home/wpitnew/json_example/index.png"), outputStream);
        conn.connect();
        conn.getResponseCode();
        conn.getResponseMessage();
        System.out.println(conn.getResponseCode()+" :  "+conn.getResponseMessage());

        InputStream inputStream=conn.getInputStream();
        BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream));
        String abc="";
        while ((abc=bufferedReader.readLine())!=null) {
            System.out.println(abc);
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            new TESTTEST().go();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

当我看到位置时，没有找到图像。我在哪里错了......还有其他选择吗？