Node.js封装post请求遇到的一个坑

function postRequest(host, port, path, postData) {
  // let postDataStr = querystring.stringify(postData);
  let postDataStr = JSON.stringify(postData);
  let options = {
    host: host,
    port: port,
    path: path,
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      // 这样写有个坑 'Content-Length': postDataStr.length
      'Content-Length': Buffer.byteLength(postDataStr,'utf8')
    }
  }
  return new Promise(function (resolve, reject) {
    let req = http.request(options, (res) => {
      res.setEncoding('utf8');
      var body = '';
      res.on('data', (d) => body += d);
      res.on('end', () => { resolve(body) });
    });
    req.on('error', (e) => { console.log('problem with request: ' + e.message) });
    req.write(postDataStr);
    req.end();
  });
}

Content-Length是计算请求参数的字节数,而非字符数.而JSON.stringify(param).length返回的是字符数

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