feat(resources) add http-project-guide

src/content/resources/topic/projects/http-project-guide/chapter-02.md

@@ -0,0 +1,66 @@
+---
+authors:
+  - "Kibb#4205"
+created_at: 2020/06/08
+title: "Chapter 2: So what are we building?"
+---
+
+## Chapter 2: So what are we building?
+
+The actual final end goal is going to remain a mystery for the time being, but what I can tell you is that we are going
+to be building a server!
+
+What is a server? Its a program that accepts incoming connections, reads and writes to that connection and closing 
+it eventually.
+
+You will hear the term socket used a lot in this project. Sockets are a way of connecting two devices on a network together.
+One socket listens, the other socket connects.
+
+The main design of sockets in the unix world is [Berkeley Sockets](https://en.wikipedia.org/wiki/Berkeley_sockets) and
+on windows its [Winsock](https://www.wikiwand.com/en/Winsock).
+
+This project will mostly be using berkeley sockets but if you want to use windows APIs feel free.
+
+In general there is a flow for sockets. On the client you follow a flow like this; 
+
+```txt
+    +---------+
+    | Connect |
+    +---+-----+
+        |
+    +---v--+
++---> Send |
+|   +---+--+
+|       |
+|   +---v--+
++---+ Recv |
+    +---+--+
+        |
+    +---v---+
+    | Close |
+    +-------+
+```
+
+First the client connects. Then the client can send and receive (recv) data until the connection is finally closed.
+
+On the server the flow is slightly more involved.
+
+```txt
++------+   +--------+   +--------+   +------+   +------+   +-------+
+| Bind +---> Listen +---> Accept +---> Recv +---> Send +---> Close |
++------+   +---^----+   +---+----+   +--^---+   +--+---+   +-------+
+               |            |           |          |
+               +------------+           +----------+
+```
+When a server starts up and creates a socket, it binds that socket to an interface and a port.
+The server will then set the socket to listening for connections, 
+when a connection comes in it needs to accept that connection. 
+Once a connection has been accepted it can receive and send to the socket the same as the client and eventually close it.
+
+This overview is brushing over a few details and you are encouraged to do your own research
+
+
+## Goals
+
+- Read up on sockets.
+- Find the documentation on your languages bindings for sockets.