Module "https" and "http""

Question 1

Module “http”: What is http.createServer?

Answer 1

Creates a new HTTP server instance that handles requests via a callback.

Question 2

Module “http”: What are req and res in http.createServer?

Answer 2

Instances of http.IncomingMessage and http.ServerResponse.

Question 3

Module “http”: How do you start a server?

Answer 3

server.listen(port, hostname, callback)

Question 4

Module “http”: How do you read request body?

Answer 4

Listen to ‘data’ and ‘end’ events on req stream.

Question 5

Module “http”: Why is request body a stream?

Answer 5

To process data incrementally without loading entire payload into memory.

Question 6

Module “http”: How do you send response?

Answer 6

Use res.write() and res.end().

Question 7

Module “http”: What does res.end() do?

Answer 7

Finalizes and sends the response.

Question 8

Module “http”: Difference between res.write and res.end?

Answer 8

write sends chunks, end finishes response.

Question 9

Module “http”: What is res.writeHead?

Answer 9

Sets status code and headers in one call.

Question 10

Module “http”: Difference between res.setHeader and res.writeHead?

Answer 10

setHeader queues headers, writeHead sends them immediately.

Question 11

Module “http”: How to set status code?

Answer 11

res.statusCode = 200

Question 12

Module “http”: What happens if res.write is called after res.end?

Answer 12

Throws an error because response is already finished.

Question 13

Module “http”: How to stream a file to client?

Answer 13

fs.createReadStream(path).pipe(res)

Question 14

Module “http”: What is http.request?

Answer 14

Used to make HTTP requests as a client.

Question 15

Module “http”: Difference between http.request and http.get?

Answer 15

http.get is a simplified version for GET requests.

Question 16

Module “http”: How do you send POST request?

Answer 16

Use http.request with method ‘POST’ and write body.

Question 17

Module “http”: What is http.Agent?

Answer 17

Manages connection pooling and reuse of sockets.

Question 18

Module “http”: How to enable keep-alive?

Answer 18

Use http.Agent with keepAlive: true.

Question 19

Module “http”: What is req.socket?

Answer 19

Underlying TCP socket.

Question 20

Module “http”: How to access headers?

Answer 20

req.headers

Question 21

Module “http”: What event handles incoming data?

Answer 21

‘data’ event

Question 22

Module “http”: What event signals request end?

Answer 22

‘end’ event

Question 23

Module “http”: How to handle aborted request?

Answer 23

Listen to ‘aborted’ or ‘close’ events on req.

Question 24

Module “http”: What is server.close()?

Answer 24

Stops the server from accepting new connections.

Question 25

Module "http": How to handle server errors?

Answer 25

Listen to 'error' event on server.

Question 26

Module "http": What is chunked transfer encoding?

Answer 26

Sending response in chunks without Content-Length.

Question 27

Module "http": How to manually parse URL?

Answer 27

Use new URL(req.url, base).

Question 28

Module "http": What is http.IncomingMessage?

Answer 28

Represents incoming request.

Question 29

Module "http": What is http.ServerResponse?

Answer 29

Represents outgoing response.

Question 30

Module "http": How to handle timeouts?

Answer 30

server.setTimeout() or req.setTimeout().

Question 31

Module "https": What is https module?

Answer 31

HTTP over TLS providing encrypted communication.

Question 32

Module "https": How to create HTTPS server?

Answer 32

https.createServer({ key, cert }, handler)

Question 33

Module "https": What is required for HTTPS server?

Answer 33

SSL/TLS certificate and private key.

Question 34

Module "https": What is TLS?

Answer 34

Protocol providing encryption and secure communication.

Question 35

Module "https": What is https.request?

Answer 35

Client method for making HTTPS requests.

Question 36

Module "https": What is https.get?

Answer 36

Simplified GET request over HTTPS.

Question 37

Module "https": What is https.Agent?

Answer 37

Manages HTTPS connections and TLS settings.

Question 38

Module "https": How to enable keep-alive in HTTPS?

Answer 38

Use https.Agent with keepAlive: true.

Question 39

Module "https": What is rejectUnauthorized option?

Answer 39

Controls whether invalid SSL certs are rejected.

Question 40

Module "https": What happens if certificate is invalid?

Answer 40

Request fails unless rejectUnauthorized is false.

Question 41

Module "https": How to pass custom CA?

Answer 41

Provide ca option in request or agent.

Question 42

Module "https": What is SNI?

Answer 42

Server Name Indication for selecting certificate by hostname.

Question 43

Module "https": What is handshake?

Answer 43

Process of establishing secure TLS connection.

Question 44

Module "https": What is ALPN?

Answer 44

Protocol negotiation (e.g., HTTP/1.1 vs HTTP/2).

Question 45

Module "https": How to debug HTTPS issues?

Answer 45

Check certificates, enable logging, inspect TLS errors.

Question 46

Module "https": What is key difference from http module?

Answer 46

Adds TLS encryption layer over HTTP.