AJAX

Question 1

What is a client?

Answer 1

A computer/server that sends request for information

Question 2

What is a server?

Answer 2

A piece of software provides data or behavior in response to requests

Question 3

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

Answer 3

GET

Question 4

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

Answer 4

1. HTTP method
2. Request target/destination (usually url)
3. HTTP version

Ex, GET/ _HTTP/ 1.1

Question 5

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

Answer 5

1. Protocol version (usually HTTP/1,1)
2. A status code (indicating success or failure of the request)
3. A status text

Example: HTTP/1.1 404 Not Found. or HTTP/1.1 200 OK

Question 6

What are HTTP headers?

Answer 6

Additional data about a request or response that is currently being sent

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

Question 9

What is AJAX?

Answer 9

It’s 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

Asynchronus JavaScript And XML

Question 11

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

Answer 11

XMLHttpRequest

Question 12

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

Answer 12

‘load’

Question 13

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

Answer 13

They share a prototype