How does this chart work?

Question

User interface

Good day. Where do charts on sites like: olyptrade, binomo, etc.
get information about exchange rates? After all, if you open the network monitor in the same firefox, then no data exchange occurs. How can this be?

Answer 1

network monitor will only show http requests. But such requests are too slow to display a chart of currency fluctuations in real time. Here, most likely, a socket connection is used. You can try to write one yourself using, for example, the WebRTC library.