HTTP

Question 1

What is a client?

Answer 1

Clients initiate communication sessions with servers, which await incoming requests.
It’s what accesses a service made available by a server
* send out initial request for information

Question 2

What is a server?

Answer 2

Providers of a resource or service (?)
A server host runs one or more server programs, which share their resources with clients
Provides a function or service to clients
*servers are constantly waiting for requests

Question 3

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

Answer 3

GET

* not providing additional information yourself, but just asking for information

Question 4

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

Answer 4

An HTTP method (GET, PUT, POST), request target (usually a URL), and HTTP version (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

The protocol version (usually HTTP/1.1), status code (indicating success or failure of the request), and status text (brief, purely informational, textual description of the status code to help human understand the HTTP message)

Question 6

What are HTTP headers?

Answer 6

Let the client and 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.
* similar to element in html

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

Not all requests have one: requests fetching resources, like GET, HEAD, DELETE, or OPTIONS, usually don’t need one.