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Coddy

Networking with the Terminal

via Coddy

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Overview

Learn how machines actually talk to each other, from the command line. Addresses and DNS, ports and sockets, whether a host is reachable, and HTTP by hand with curl: GET, POST, headers, status codes and HTTPS. Built for IT, support and backend work.

Prerequisites:

  • Comfortable running commands in a terminal
  • No networking knowledge required

Syllabus

How Networks Talk

  • What Is a Network
  • Clients and Servers
  • IP Addresses
  • Your First Request

Names and DNS

  • Why Names Exist
  • The Hosts File
  • Looking Up a Name
  • Record Types
  • Recap: Names

Ports and Sockets

  • What Is a Port
  • Well-Known Ports
  • Localhost
  • Listening vs Connecting
  • Recap: Ports

Is It Reachable?

  • ICMP and ping
  • Reading Ping Output
  • When Ping Lies
  • Refused or Timed Out
  • Recap: Reachability

HTTP by Hand

  • Anatomy of a Request
  • Request Methods
  • Status Codes
  • Response Headers
  • Writing a Response
  • Recap: HTTP Basics

curl in Depth

  • Seeing the Headers
  • Saving Responses
  • Custom Headers
  • Status and Timing
  • curl Exit Codes
  • Recap: curl Flags

Sending Data

  • POST with -d
  • What -d Actually Sends
  • Form Encoding
  • Sending JSON
  • PUT and DELETE
  • Recap: Writing Data

HTTPS and TLS

  • Why HTTPS
  • The Scheme Picks the Port
  • Certificates and Trust
  • When TLS Fails
  • Recap: HTTPS

Auth and Debugging

  • API Keys and Bearer
  • The User Agent
  • Timeouts and Retries
  • Reading a Failure
  • Recap: Debugging

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