WebSocket for real-time communication in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the protocol used for real-time communication.

HLD

The client initiates a connection using the [1] protocol.

Drag options to blanks, or click blank then click option'

AWebSocket

BHTTP

CFTP

DSMTP

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing HTTP which is request-response only.

Selecting FTP or SMTP which are unrelated to real-time web communication.

The WebSocket protocol enables full-duplex communication channels over a single TCP connection, ideal for real-time data exchange.

2fill in blank

medium

Complete the code to identify the server component that handles WebSocket connections.

HLD

The [1] manages incoming WebSocket connections and message routing.

Drag options to blanks, or click blank then click option'

AWebSocket server

BLoad balancer

CDatabase server

DCache server

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing load balancer with connection handler.

Selecting database or cache servers which do not manage WebSocket connections.

The WebSocket server is responsible for accepting connections and managing message flow between clients.

3fill in blank

hard

Fix the error in the connection upgrade process code snippet.

HLD

HTTP request header must include 'Upgrade: [1]' to switch protocols.

Drag options to blanks, or click blank then click option'

AHTTP/2

BTLS

CWebSocket

DFTP

Attempts:

3 left

💡 Hint

Common Mistakes

Using HTTP/2 which is a different protocol.

Using TLS or FTP which are unrelated to WebSocket upgrade.

The 'Upgrade' header must specify 'websocket' to initiate the protocol switch from HTTP to WebSocket.

4fill in blank

hard

Fill both blanks to complete the message flow in WebSocket communication.

HLD

Client sends a [1] frame, and server responds with a [2] frame.

Drag options to blanks, or click blank then click option'

Atext

Bbinary

Cpong

Dping

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'ping' and 'pong' frames.

Using 'text' or 'binary' frames for heartbeat messages.

In WebSocket, a client sends a 'ping' frame to check connection health, and the server replies with a 'pong' frame.

5fill in blank

hard

Fill all three blanks to complete the architecture components for scalable WebSocket service.

HLD

Use a [1] to distribute connections, a [2] to maintain session state, and a [3] to handle message broadcasting.

Drag options to blanks, or click blank then click option'

Aload balancer

Bsession store

Cmessage broker

Ddatabase

Attempts:

3 left

💡 Hint

Common Mistakes

Using database instead of message broker for broadcasting.

Confusing session store with load balancer.

A load balancer distributes client connections across servers, a session store keeps track of user sessions, and a message broker efficiently broadcasts messages to clients.