Why is my stream error handler not being called?

I have the following restify handler:

var assert = require('assert-plus');
var request = require('request');

function postParseVideo(req, res, next) {
  assert.string(req.body.videoSourceUrl, 'videoSourceUrl');

  var stream = request.get({uri: req.body.videoSorceUrl});
  stream.on('response', function(parseResponse) {
    fnThatTakesAReadableStream(parseResponse, function(err, data) {
      if (err) {
        console.log(err);
        next(err);
      } else {
        res.send(201, null, {Location: data.location});
        next();
      }
    });
  });
  stream.on('error', function(err) {
    console.log(err);
    next(err);
  });
};

When I run this, neither of the stream event handlers is ever called. Instead, an error bubbles up to the restify server: {"code":"InternalError","message":"options.uri is a required argument"}. I looked at the source for request v2.54.0, and it looks like that error message must be coming from line 406 of restify.js, which reads:

return self.emit('error', new Error('options.uri is a required argument'))

I have used streams successfully in a number of other languages, but I’m new to using them in JavaScript. It seems to me like request.get is throwing a synchronous error, when it should be emitting an 'error' event. Is there something I’m fundamentally misunderstanding about how streams are implemented in Node?