HTTP

Question 1

What is a client?

Answer 1

A piece of computer hardware or software that accesses a service made available by a server

Question 2

What is a server?

Answer 2

A piece of hardware or software that provides functionality for other programs or devices

Question 3

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

Answer 3

GET method

Question 4

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

Answer 4

1) An HTTP method, a verb (GET, PUT, POST) or a noun (HEAD or OPTIONS) describing the action to be performed.

2) The requested target
(absolute path: POST / HTTP/1.1
GET /background.png HTTP/1.0
HEAD /test.html?query=alibaba HTTP/1.1
OPTIONS /anypage.html HTTP/1.0)

(A complete URL aka. Absoluet Form: used with GET when connected to a proxy
ex: GET https://developer.mozilla.org/en-US/docs/Web/HTTP/Messages HTTP/1.1)

(The authority component of a URL, consisting of the domain name and optionally the port prefixed by a ‘:’ , is called the Authority form. Used only with CONNECT when setting up an HTTP tunnel.
ex: CONNECT developer.mozilla.org:80 HTTP/1.1)

(The asterisk form, a simple asterisk ‘*’ is used with OPTIONS, representing the server as a whole
ex: OPTONS * HTTP/1.1)

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

Answer 5

1) The protocol version
2) A status code, indicating success or failure of the request
3) A status text. A brief, purely informational description of the status code

Question 5

What are HTTP headers?

Answer 5

A place to send information between a request and a response

Question 6

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

Answer 6

MDN

Question 7

What is client? (recap)

Answer 7

Server Requester

Question 8

What is a server? (recap)

Answer 8

Receives the response and returns it

Question 9

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

Answer 9

Get

Question 10

What is the difference between http and https?

Answer 10

https is secure

Question 11

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

Answer 11

method / target / http version

Question 12

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

Answer 12

method / target / error or success code

Question 13

What are HTTP headers? (recap)

Answer 13

A place to send information between a request and a response

Question 14

Is a body required for a valid HTTP message? (recap)

Answer 14

No

Question 15

Main http methods

Answer 15

GET, PUT, POST, DELETE

Question 16

What does fetch() return?

Answer 16

A promise

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

In the option Ex: fetch(‘url’, GET)

Question 19

How does fetch report errors?

Answer 19

With a try catch, and when encountering a network error

Question 20

How can useEffect be used to load data for a component?

Answer 20

It can be used whenever you want something happening before it loads or when something in the URL is changing

Question 21

What browser function can be used to make HTTP request to a server in React?

Answer 21

fetch( )

Question 22

How do you use useEffect to load component data just once when the component mounts?

Answer 22

By passing an empty array as a dependency

Question 23

How do you use useEffect to load component data every time the data key changes?

Answer 23

By passing the key as a dependency

Question 24

In a large-scale production app, what are some better alternative for loading and managing backend data?

Answer 24

React Query and Vercel SWR