如何将网络请求内容转换为音频文件并下载？

<code>POST /chat/asr/temp HTTP/1.1
Host: 192.168.10.168:8093
Connection: keep-alive
Content-Length: 338
Accept: application/json, text/plain, */*
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarybdmabvw8jvemdxc2
Origin: http://192.168.10.168:8093
Referer: http://192.168.10.168:8093/
Accept-Encoding: gzip, deflate
Accept-Language: zh-cn,zh;q=0.9</code>

let xhr = new XMLHttpRequest();
xhr.open('POST', '/chat/asr/temp');
xhr.responseType = 'blob';
xhr.onload = function() {
  if (xhr.status === 200) {
    let blob = xhr.response;
    let url = URL.createObjectURL(blob);
    let a = document.createElement('a');
    a.href = url;
    a.download = 'audio_file.mp3'; // 自定义文件名
    a.click();
    URL.revokeObjectURL(url); // 释放 URL
  }
};
xhr.send();

let audio = document.createElement('audio');
audio.controls = true;
audio.src = url;
document.body.appendChild(audio);