Master Node.js HTTP: A Comprehensive Guide for Full-Stack Web Development

Question 1

Which HTTP method is primarily used to fetch data from a server?

Accepted Answer

GET

Answer

PUT

Answer

DELETE

Answer

POST

Question 2

In Node.js HTTP, what is the main purpose of the `res.writeHead()` function?

Accepted Answer

To set the HTTP response headers before sending the body.

Answer

To handle incoming HTTP requests.

Answer

To create a new HTTP server instance.

Answer

To send the HTTP response body.

Question 3

Which Node.js module is specifically designed for creating HTTP servers?

Accepted Answer

http

Answer

path

Answer

url

Answer

fs

Question 4

How can you differentiate and handle incoming requests based on their URL paths in Node.js?

Accepted Answer

By examining the `req.url` property and using conditional statements.

Answer

Using the `http.createServer()` method.

Answer

Using the `res.writeHead()` function.

Question 5

What is a key characteristic of a RESTful API?

Accepted Answer

It uses standard HTTP methods (GET, POST, PUT, DELETE) to interact with resources.

Answer

It uses only GET requests.

Answer

It uses a specific programming language.

Question 6

In a RESTful API, which HTTP method is commonly used to create new resources?

Accepted Answer

POST

Answer

PUT

Answer

GET

Answer

DELETE

Question 7

What does the `req.query` property provide access to in Node.js HTTP?

Accepted Answer

Query parameters appended to the URL.

Answer

Request headers.

Answer

The server's IP address.

Answer

The request body.

Question 8

How do you send a JSON response in Node.js HTTP?

Accepted Answer

Using `res.json(data);`

Answer

Using `res.write(data);`

Answer

Using `res.end(data);`

Answer

Using `res.send(data);`

Question 9

What is a common practice for handling errors in Node.js HTTP servers?

Accepted Answer

Using `try...catch` blocks and error handling middleware.

Answer

Using the `res.error()` function.

Answer

Ignoring errors and letting the server crash.

Question 10

Which Node.js module is used to create a web server?

Accepted Answer

`http`

Answer

`url`

Answer

`fs`

Answer

`net`

Question 11

What does the following code snippet do?

```javascript
const http = require('http');

http.createServer((req, res) => {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World!');
}).listen(3000);
```

Accepted Answer

Creates a server that listens on port 3000 and responds with 'Hello World!'

Answer

Sends an HTTP request to a server at port 3000.

Answer

Reads a file named 'Hello World!' and displays its contents.

Question 12

Which HTTP status code indicates success with content returned?

Accepted Answer

200 (OK)

Answer

301 (Moved Permanently)

Answer

500 (Internal Server Error)

Answer

404 (Not Found)

Question 13

What is the purpose of `req.url` in a Node.js HTTP request handler?

Accepted Answer

It provides the URL path requested by the client.

Answer

It contains the HTTP method (GET, POST, etc.) used in the request.

Answer

It holds the data sent in the body of a POST request.

Answer

It stores the headers sent by the client.

Question 14

How can you access query parameters in a Node.js HTTP request handler?

Accepted Answer

Using `url.parse(req.url, true).query`

Answer

By accessing `req.params` directly.

Answer

Through the `req.body` object.

Answer

They are automatically parsed into variables.

Question 15

What is the primary difference between `res.write()` and `res.end()`?

Accepted Answer

`res.write()` sends data in chunks, while `res.end()` signals the end of the response.

Answer

`res.write()` is used for text data, and `res.end()` is for binary data.

Answer

`res.write()` sends headers, and `res.end()` sends the body.

Question 16

What is a common use case for creating a static file server with Node.js HTTP?

Accepted Answer

Serving HTML, CSS, and JavaScript files for a website.

Answer

Handling complex database queries.

Answer

Creating a RESTful API.

Question 17

What is the purpose of using a routing library like Express.js with Node.js HTTP?

Accepted Answer

To define routes and handle different HTTP methods and URLs more easily.

Answer

To parse incoming JSON data.

Answer

To create a database connection.

Question 18

What is the difference between a GET and a POST request in a RESTful API?

Accepted Answer

GET requests retrieve data, while POST requests send data to be processed.

Answer

GET requests are always faster than POST requests.

Answer

GET requests use query parameters, while POST requests use headers.

Question 19

What is a potential security risk to consider when building a Node.js web server?

Accepted Answer

Cross-Site Scripting (XSS) vulnerabilities.

Answer

Inefficient database queries.

Answer

Slow file system reads.

Question 20

What is the primary function of the 'http' module in Node.js?

Accepted Answer

Creating and managing HTTP servers and clients.

Answer

Managing file system access.

Answer

Handling database interactions.

Answer

Performing asynchronous operations.

Question 21

Which method of the 'http' module is used to create a server?

Accepted Answer

createServer()

Answer

createResponse()

Answer

createRequest()

Answer

createClient()

Question 22

How do you listen for incoming requests on a specific port using the Node.js HTTP server?

Accepted Answer

server.listen(port);

Answer

server.start(port);

Answer

server.connect(port);

Answer

server.bind(port);

Question 23

What is the purpose of the 'request' object passed to the server's 'request' event handler?

Accepted Answer

It provides information about the incoming HTTP request.

Answer

It handles outgoing HTTP responses.

Answer

It manages server-side routing.

Question 24

What is the correct way to send an HTTP response with a status code of 200 (OK) and a plain text message?

Accepted Answer

response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello World!');

Answer

response.send('Hello World!');

Answer

response.write(200, 'Hello World!');

Question 25

How can you access the URL path of an incoming request in Node.js?

Accepted Answer

request.url

Answer

request.path

Answer

request.route

Question 26

What is the primary purpose of a RESTful API?

Accepted Answer

To provide a standardized way for applications to interact with data and services over HTTP.

Answer

To manage databases efficiently.

Answer

To enhance front-end user interfaces.

Question 27

Which HTTP method is typically used to create new resources in a RESTful API?

Accepted Answer

POST

Answer

GET

Answer

PUT

Question 28

What is a middleware function in Node.js HTTP?

Accepted Answer

A function that can modify or intercept HTTP requests and responses before they reach the final handler.

Answer

A function that handles asynchronous operations.

Question 29

What is the advantage of using a web framework like Express.js on top of Node.js HTTP?

Accepted Answer

It provides a higher level of abstraction for routing, middleware, and templating, simplifying development.

Answer

It enhances database performance.