HTTP

Question 1

What is a client?

Answer 1

a client is a piece of computer hardware or software that accesses a service made available by a server as part of the client–server model of computer networks.

Question 2

What is a server?

Answer 2

a server is a piece of computer hardware or software (computer program) that provides functionality for other programs or devices, called “clients”.

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. An HTTP method, a verb (like GET, PUT or POST) or a noun (like HEAD or OPTIONS), that describes the action to be performed.
2. The request target, usually a URL, or the absolute path of the protocol, port, and domain are usually characterized by the request context.
3. The HTTP version, which defines the structure of the remaining message, acting as an indicator of the expected version to use for the response.

Question 5

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

Answer 5

1. The protocol version, usually HTTP/1.1.
2. A status code, indicating success or failure of the request. Common status codes are 200, 404, or 302
3. A status text. A brief, purely informational, textual description of the status code to help a human understand the HTTP message.

Question 6

What are HTTP headers?

Answer 6

HTTP headers let the client and the server pass additional information with an HTTP request or response. An HTTP header consists of its case-insensitive name followed by a colon (:), then by its value. Whitespace before the value is ignored.

The metadata, like the head element in HTTP

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

A technique for loading data into a page without having to reload 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

XMLHttpRequests

Question 12

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

Answer 12

load

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

prototypal inheritance

Question 14

What is on the first line of an HTTP request message?

Answer 14

An HTTP method, The request target, The HTTP version

Question 15

What is on the first line of an HTTP response message?

Answer 15

The protocol version, A status code, A status text.

Question 16

What does fetch() return?

Answer 16

returns a promise containing the response (a Response object).

Question 17

What is the default request method used by fetch()?

Answer 17

GET

Question 18

How do you specify the request method (GET, POST, etc.) when calling fetch?

Answer 18

The fetch() method can optionally accept a second parameter, an init