In this task, my objective was to create two servers serving a simple webpage with hundreds of images.
First server, http1.js serves the images over HTTP/1.1, which results in images being loaded one after another with max count of 6 simultaneous requests.
Example of HTTP/1.1 communication, each image load has to wait because of the limitation (6 requests).
The second server, http2.js uses advantage of HTTP/2 with the HTTP/2 push and multiplexing, so all the images can be loaded "at once" in single TCP connection.
Example of HTTP/2 communication, images are pushed, so the data are transferred at once and there is no green waiting.