Angular2 server-side-listener for file uploads?

In an Angular2 CLI project, i finnaly implemented the upload button from Vaadin. The button UI works, but i don't know how to actually make it upload a file anywhere.

I keep finding solutions about express server that listens for file uploads, multer or node server, and i really have no idea how to write such a server, where to put it, how to start it, how to access it, etc.. I figured that something as trivial as file upload should be easier to achieve, but it seems is not.

What is a simple solution to implement along side Angular2 in order make the button actually upload files somewhere so i can download them later?

The question is also on StackOverflow:
http://stackoverflow.com/questions/38457712/angular2-server-side-listener-for-file-uploads

Hey there!

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