https://gafferongames.com/post/udp_vs_tcp/

https://gafferongames.com/post/what_every_programmer_needs_to_know_about_game_networking/

Low-level networking:

• UDP (unreliable, unordered and fast)
  • only sends packets
    • doesn't know about connections
  • low latency, small packet size
• TCP (reliable, ordered, and slow)
  • ensures packets arrive reliably and in order
    • has understanding of a "connection"
  • higher latency (error correction)
  • batches packets for less per-packet overhead

High-level networking

• SSL

• HTTP

  • HTTPRequest node
    • backed by lower-level HTTPClient
    • make posts/requests to urls
    • receive responses in signals
    • each node can services one request at a time, so may need to handle creation/deletion at runtime

  extends CanvasLayer
  
  func _ready():
      $HTTPRequest.connect("request_completed", self, "_on_request_completed")
  
  // request
  func _on_Button_pressed():
      $HTTPRequest.request("<http://www.mocky.io/v2/5185415ba171ea3a00704eed>")
  
  func _on_request_completed(result, response_code, headers, body):
      var json = JSON.parse(body.get_string_from_utf8())
      print(json.result)
  
  //post
  func _make_post_request(url, data_to_send, use_ssl):
      // Convert data to json string:
      var query = JSON.print(data_to_send)
      // Add 'Content-Type' header:
      var headers = ["Content-Type: application/json"]
      $HTTPRequest.request(url, headers, use_ssl, HTTPClient.METHOD_POST, query)
  

Mid-level abstraction

NetworkedMultiplayerPeer

• Inherits from PacketPeer: serialization, sending/receiving data
• often use the higher-level abstraction

SceneTree

Controls networking in Godot

Either a server or a client

Needs to be provided with a NetworkedMultiplayerPeer