What is HTTP (Hyper Text Transfer Protocol)?

It's how computers talk to each other in the internetz!

Call and Response.

Parts of HTTP Request and Response:

  • URL - Location of data we are requesting
  • Method/Verb - What type of action are we taking
  • Headers - Extra info
  • Body - Meat of the content
  • Response Code - TLDR; did things break?

URL and Method only apply to Requests not Responses

HTTP Methods/Verbs

Along with the URL the method says WHAT we are trying to do

  • GET - READ ONLY (no body can be sent) - Get information from a resource
  • POST - Create something into the resource that wasn't there before or send a command
  • PUT or PATCH - Changes an existing resource
  • DELETE - Remove an existing resource
  • OPTIONS - What can I do with this resource

HTTP Headers

Extra Info along with the data being sent or received

Common Headers

  • Accept - What type of data do we know how to read (PLEASE SEND ME THIS or I will break... 😞)
  • Content-Type - What is the format of information we are sending
  • Authorization - Who are we and can we prove it

HTTP Body (what is this application/json thing anyway)

This is the main course!!!


Javascript Object Notation

Human and Machine readable way of describing data

  "foo": "bar",
  "names": [
  "child": {
    "x": 2,
    "y": false


  • All quotes are double quotes
  • All property names are in quotes
  • Not variables
  • Only a few data types
    • Booleans
    • Null/Undefined
    • Numbers (Integers or Decimals)
    • Strings
    • Arrays
    • Objects (POJOs)

To create a JSON string from a POJO in Javascript run JSON.stringify.

If you have a JSON string, to turn it into a POJO run JSON.parse.

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