送信要求の場合

public static void main(String[] args) {
    String host = "https://www.webconnect.hulft.com";
    String apiKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
    try {
        URL url = new URL(host + "/api/v2/browser-transfer/definition/hulft-to-browser");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        String postData = "{ \"hulftToBrowserDefinitionId\":\"xxxxxxxx\",\"description\":\"xxxxxxxx\",\"fileId\":\"TEST\",\"memo\":\"xxxxxxxx\","
                + "\"browser\":{\"useReceiveFileName\":\"true\",\"connectionId\":\"xxxxxxxx\",\"agentId\":\"xxxxxxxx\",\"receiveFileName\":\"xxxxxxxx\"},"
                + "\"hulft\":{\"hulftRequestAcknowledgePort\":31000,\"connectionId\":\"xxxxxxxx\",\"agentId\":\"xxxxxxxx\",\"hostName\":\"xxxxxxxx\","
                + "\"msg0\":\"xxxxxxxx\",\"msg1\":\"xxxxxxxx\",\"msg2\":\"xxxxxxxx\",\"msg3\":\"xxxxxxxx\",\"msg4\":\"xxxxxxxx\",\"msg5\":\"xxxxxxxx\","
                + "\"msgl0\":\"xxxxxxxx\",\"msgl1\":\"xxxxxxxx\"} }";
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setRequestProperty("Authorization", "Bearer " + apiKey);
        connection.setRequestProperty("Content-Type", "application/json");
        connection.setRequestProperty("Content-Length", Integer.toString(postData.length()));
        try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()))) {
            writer.write(postData);
        }
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        }
    } catch (IOException ex) {
        // error
    }
}

// load jquery 
var host = 'https://www.webconnect.hulft.com';
var apiKey = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
$.ajax({
  type: 'POST',
  url: host + '/api/v2/browser-transfer/definition/hulft-to-browser',
  headers: {
    Authorization: 'Bearer ' + apiKey
  },
  contentType: 'application/json',
  data: JSON.stringify({
    "hulftToBrowserDefinitionId":"xxxxxxxx","description":"xxxxxxxx","fileId":"TEST","memo":"xxxxxxxx",
    "browser":{"useReceiveFileName":"true","connectionId":"xxxxxxxx","agentId":"xxxxxxxx","receiveFileName":"xxxxxxxx"},
    "hulft":{
      "hulftRequestAcknowledgePort":31000,"connectionId":"xxxxxxxx","agentId":"xxxxxxxx","hostName":"xxxxxxxx",
      "msg0":"xxxxxxxx","msg1":"xxxxxxxx","msg2":"xxxxxxxx","msg3":"xxxxxxxx","msg4":"xxxxxxxx","msg5":"xxxxxxxx",
      "msgl0":"xxxxxxxx","msgl1":"xxxxxxxx"
    }
  })
}).done(function(data, status, xhr) {
  console.log(data);
}).fail(function(data, status, xhr) {
  console.log(data);
});