Stream video to an ios app from a mongoDB using Gridfs-stream - ios

Question

I'm a relatively new programmer trying to create an ios video-streaming app in swift. I've written the backend in node.js and have a mongoose connection to a mongoDB. I've been able to upload videos to the database using the following code and gridfs
function (req, res, next) {
req.pipe(gfs.createWriteStream({ filename: 'filename'}));
res.send("success");
};
I'm attempting to stream the videos using the following code
gfs.findOne({_id: req.params.id}, function (err, file) {
if (err) {
return res.status(400).send(err);
} else if (!file) {
return res.status(404).send(' ');
} else {
res.header("Content-Type","video/mp4");
res.header("X-Content-Type-Options", "nosniff");
res.header("Accept-Ranges", "bytes");
res.header("Content-Length",file.length);
var readStream = gfs.createReadStream({_id: file._id});
readStream.on('open', function () {
console.log('Starting download...');
});
readStream.on('data', function (chunk) {
console.log('Loading...');
});
readStream.on('end', function () {
console.log('Video is ready to play');
});
readStream.on('error', function (err) {
console.log('There was an error with the download' + err);
res.end();
});
readStream.pipe(res);
}
});
When I run a server on localhost and attempt to access the videos via google chrome, all I get is the default playback screen but no video. However, ultimately I am trying to playback on an ios app. When I try the same thing on swift (using the local host url passed in to mpmovieplayer), there is also no video playback. I know the get request is going through because my console outputs the proper response with the filesize. I have even been fiddling with alamofire on the front end and can see the hexadecimal representation of the video in the response data. Can anybody help with this code? Do I need to update my res.header to fit some IOS specification? Should I even be using alamofire at all for this? Thanks in advance for your responses.