HTTP

Question 1

What is a client?

Answer 1

a client initiates a request for a service from a server

Question 2

What is a server?

Answer 2

a server listens for requests and provides a service to clients

Question 3

Which HTTP method does a browser issue to a web server when you visit a URL?

Answer 3

GET method

Question 4

What three things are on the start-line of an HTTP request message?

Answer 4

HTTP method, request target, HTTP version

Question 5

What three things are on the start-line of an HTTP response message?

Answer 5

protocol version, status code (200, 404, 302), status text

Question 6

What are HTTP headers?

Answer 6

they let the client and server pass additional info with an HTTP request/response

Question 7

Where would you go if you wanted to learn more about a specific HTTP Header?

Answer 7

mdn

Question 8

Is a body required for a valid HTTP request or response message?

Answer 8

no (response: GET, request: 201 Created or 404 Not Found)

Question 9

What is AJAX?

Answer 9

a technique for loading data into part of a page without having to refresh the entire page

Question 10

What does the AJAX acronym stand for?

Answer 10

Asynchronous JavaScript And XML

Question 11

Which object is built into the browser for making HTTP requests in JavaScript?

Answer 11

HMLHttpRequest object

Question 12

What event is fired by XMLHttpRequest objects when they are finished loading the data from the server?

Answer 12

load event

Question 13

An XMLHttpRequest object has an addEventListener( ) method just like DOM elements. How is it possible that they both share this functionality?

Answer 13

they both have the EventTarget prototype, therefore both can use the addEventListener( ) method