user84891: for the propagation process between nodes in the networks, witch application layer protocol they use, HTTP or WebSocket?
And if they use WebSocket, does each node maintain a continuous connection with each of the other nodes?

user15358: Used Bitcoin protocol over TCP/IP protocol. 
You can read more on this link https://en.bitcoin.it/wiki/Protocol_documentation#Message_types

84891: <p>for the propagation process between nodes in the networks, witch application layer protocol they use, HTTP or WebSocket?</p>

<p>And if they use WebSocket, does each node maintain a continuous connection with each of the other nodes?</p>
 15358: <p>Used Bitcoin protocol over TCP/IP protocol. 
You can read more on this link <a href="https://en.bitcoin.it/wiki/Protocol_documentation#Message_types" rel="nofollow noreferrer">https://en.bitcoin.it/wiki/Protocol_documentation#Message_types</a></p>
