如果要手动侦听响应流，则要使用response对象:

You want to use the response object if you're manually listening for the response stream:

var req = require('request');
var s3 = new AWS.S3({params: {Bucket: myBucket, Key: s3Key}});
var imageStream = req.get(url)
    .on('response', function (response) {
      if (200 == response.statusCode) {
        s3.upload({Body: response, ACL: "public-read", CacheControl: 5184000}, function (err, data) {  //2 months
          console.log(err,data);
        });
      }
    });
});