Practical - Backend

Question 1

What are the client-server model process steps?

Answer 1

1) Make Server Requests
2) Receive Responses
3) Display the HTML page

Question 2

What are the Components of an HTTP Request?

Answer 2

Method
URL/URI
HTTP Version
Headers
Body (optional)
Query Parameters (optional)
Cookies (optional)

Question 3

List the available HTTP Methods

Answer 3

GET
POST
PUT
DELETE
HEAD
CONNECT
OPTIONS
TRACE
PATCH

Question 4

What are the possible HTTP Response Status Codes ranges?

Answer 4

• Informational responses (100 – 199)
• Successful responses (200 – 299)
• Redirection messages (300 – 399)
• Client error responses (400 – 499)
• Server error responses (500 – 599)

Question 5

What is the utility of HTTP Headers?

Answer 5

Communicate information between client and server

Question 6

What are the types of HTTP Headers?

Answer 6

Request or Response Headers

Question 7

How does the server handle requests?

Answer 7

Through sockets

Question 8

What is a server?

Answer 8

• Hardware
  A computer that runs server software and stores website component files
• Software
  A program that controls how web users access the hosted files

Question 9

What happens when you navigate to a url?

Answer 9

1. The browser (e.g., Chrome) creates an HTTP GET request. (client-side)
2. The request is then sent to the server. (client-server)
3. The web server program listens to the request through a socket and generates
   the response. (server-side)
4. The server sends the HTTP response to the client machine. (server-client)
5. The browser receives the response and renders the website. (client-side)

Question 10

What are the layers in a Three-Tier Architecture?

Answer 10

• Presentation Tier
• Bussiness/Application Tier
• Data/Storage Tier

Question 11

What are the advantages of Single Page Applications?

Answer 11

• Provide a seamless user experience, especially when the application needs to load data frequently.
• Ease development by separating data presenting and data processing logics.

Question 11

What is a Single Page Application?

Answer 11

• Usually, all necessary HTML, CSS, and Javascript files are retrieved in a single page load.
• The web page is dynamically rewritten with new data from the web server. Client-side Rendering

Question 12

What does Uniform Resource Locator comprise of?

Answer 12

The URL comprises Scheme, Authority, Path, Parameters, and Fragment.

Question 13

What is REST?

Answer 13

REST (Representational State Transfer) is an architectural style described by Roy Thomas Fielding in his doctoral dissertation, published in 2000.

Question 14

List the 6 REST Principles

Answer 14

1. Client-server
2. Stateless
3. Cacheable
4. Uniform interface
5. Layered system
6. Code on demand

Question 15

What is a RESTful API?

Answer 15

A HTTP-based RESTful API is a Web API written in the style of REST.
* The request uses HTTP methods to access resources.
* The request is sent to an endpoint URL.
* The request uses JSON or XML to transform data.