"Destination for messages that repeatedly fail processing" — in WebSocket, this describes which of the following?

dead letter queue: Destination for messages that repeatedly fail processing.

"Definition of an event's structure used for validation" — in WebSocket, this describes which of the following?

event schema: Definition of an event's structure used for validation.

"HTTP status completing a WebSocket upgrade" — in WebSocket, this describes which of the following?

101 Switching Protocols: HTTP status completing a WebSocket upgrade.

"Keep-alive mechanism verifying the connection is live" — in WebSocket, this describes which of the following?

ping/pong frames: Keep-alive mechanism verifying the connection is live.

"Mechanism handling consumers slower than producers" — in WebSocket, this describes which of the following?

backpressure: Mechanism handling consumers slower than producers.

Which statement correctly describes WebSocket?

The 101 Switching Protocols response completes the handshake.

Identify the accurate statement about WebSocket:

Async API testing asserts on events, not synchronous responses.

"Named stream of events consumed by subscribers" — in WebSocket, this describes which of the following?

Kafka topic: Named stream of events consumed by subscribers.

Which of the following statements about WebSocket is TRUE?

SSE is simpler than WebSocket when only server push is needed.

"TLS-secured WebSocket scheme" — in WebSocket, this describes which of the following?

wss://: TLS-secured WebSocket scheme.

WebSocket & Async APIs interview questions — Medium

149 medium-level WebSocket & Async APIs questions from our API Testing bank, each with the correct answer and an explanation of why it is correct.

What this covers

WebSocket & Async APIs appears throughout API Testing interviews. At medium level, interviewers are typically checking that you have used it in practice: what you configured, what broke, and how you knew it worked. Work through these, then explain your answer out loud; the second part is what interviews actually test.

Other levels:Hard (75)Easy (74)

20 example questions

1. "Destination for messages that repeatedly fail processing" — in WebSocket, this describes which of the following?
- A. 101 Switching Protocols.
- B. Wss://.
- C. Ping/pong frames.
- D. Dead letter queue.correct
Why: dead letter queue: Destination for messages that repeatedly fail processing.
2. "Definition of an event's structure used for validation" — in WebSocket, this describes which of the following?
- A. 101 Switching Protocols.
- B. Kafka topic.
- C. Event schema.correct
- D. Dead letter queue.
Why: event schema: Definition of an event's structure used for validation.
3. "HTTP status completing a WebSocket upgrade" — in WebSocket, this describes which of the following?
- A. Event schema.
- B. Ping/pong frames.
- C. Backpressure.
- D. 101 Switching Protocols.correct
Why: 101 Switching Protocols: HTTP status completing a WebSocket upgrade.
4. "Keep-alive mechanism verifying the connection is live" — in WebSocket, this describes which of the following?
- A. Wss://.
- B. 101 Switching Protocols.
- C. Kafka topic.
- D. Ping/pong frames.correct
Why: ping/pong frames: Keep-alive mechanism verifying the connection is live.
5. "Mechanism handling consumers slower than producers" — in WebSocket, this describes which of the following?
- A. 101 Switching Protocols.
- B. Ping/pong frames.
- C. Backpressure.correct
- D. Kafka topic.
Why: backpressure: Mechanism handling consumers slower than producers.
6. Which statement correctly describes WebSocket?
- A. The WebSocket handshake uses FTP rather than HTTP.
- B. Server-Sent Events allow the client to stream data to the server.
- C. AsyncAPI is a load-testing tool, not a specification.
- D. A WebSocket connection starts as an HTTP request upgraded via the Upgrade header.correct
Why: The 101 Switching Protocols response completes the handshake.
7. Identify the accurate statement about WebSocket:
- A. AsyncAPI is a load-testing tool, not a specification.
- B. Message-driven systems are often tested by publishing to and consuming from queues or topics.correct
- C. Message queues can only be tested with a web browser.
- D. WebSocket connections close automatically after every single message.
Why: Async API testing asserts on events, not synchronous responses.
8. "Named stream of events consumed by subscribers" — in WebSocket, this describes which of the following?
- A. Ping/pong frames.
- B. Backpressure.
- C. Event schema.
- D. Kafka topic.correct
Why: Kafka topic: Named stream of events consumed by subscribers.
9. Which of the following statements about WebSocket is TRUE?
- A. Server-Sent Events (SSE) stream data one-way from server to client.correct
- B. Message queues can only be tested with a web browser.
- C. WebSockets allow only the client to send messages, never the server.
- D. Server-Sent Events allow the client to stream data to the server.
Why: SSE is simpler than WebSocket when only server push is needed.
10. "TLS-secured WebSocket scheme" — in WebSocket, this describes which of the following?
- A. Dead letter queue.
- B. Wss://.correct
- C. Event schema.
- D. Kafka topic.
Why: wss://: TLS-secured WebSocket scheme.
11. In WebSocket, which of the following is described as: "Definition of an event's structure used for validation"?
- A. Kafka topic.
- B. Event schema.correct
- C. Dead letter queue.
- D. Wss://.
Why: event schema: Definition of an event's structure used for validation.
12. In WebSocket, which of the following is described as: "Keep-alive mechanism verifying the connection is live"?
- A. Ping/pong frames.correct
- B. Dead letter queue.
- C. Backpressure.
- D. Kafka topic.
Why: ping/pong frames: Keep-alive mechanism verifying the connection is live.
13. Which WebSocket concept matches this description: "Definition of an event's structure used for validation"?
- A. Event schema.correct
- B. Dead letter queue.
- C. 101 Switching Protocols.
- D. Ping/pong frames.
Why: event schema: Definition of an event's structure used for validation.
14. In the context of WebSocket, which of the following is a correct statement?
- A. A WebSocket connection starts as an HTTP request upgraded via the Upgrade header.correct
- B. Message queues can only be tested with a web browser.
- C. WebSocket connections close automatically after every single message.
- D. WebSockets allow only the client to send messages, never the server.
Why: The 101 Switching Protocols response completes the handshake.
15. Which WebSocket concept matches this description: "Destination for messages that repeatedly fail processing"?
- A. Ping/pong frames.
- B. Dead letter queue.correct
- C. Backpressure.
- D. Kafka topic.
Why: dead letter queue: Destination for messages that repeatedly fail processing.
16. In WebSocket, which of the following is described as: "Destination for messages that repeatedly fail processing"?
- A. Backpressure.
- B. Ping/pong frames.
- C. Kafka topic.
- D. Dead letter queue.correct
Why: dead letter queue: Destination for messages that repeatedly fail processing.
17. Which WebSocket concept matches this description: "Mechanism handling consumers slower than producers"?
- A. Kafka topic.
- B. Dead letter queue.
- C. Backpressure.correct
- D. 101 Switching Protocols.
Why: backpressure: Mechanism handling consumers slower than producers.
18. Which WebSocket concept matches this description: "HTTP status completing a WebSocket upgrade"?
- A. Wss://.
- B. Backpressure.
- C. 101 Switching Protocols.correct
- D. Event schema.
Why: 101 Switching Protocols: HTTP status completing a WebSocket upgrade.
19. In WebSocket, which of the following is described as: "Mechanism handling consumers slower than producers"?
- A. Event schema.
- B. Ping/pong frames.
- C. Kafka topic.
- D. Backpressure.correct
Why: backpressure: Mechanism handling consumers slower than producers.
20. In WebSocket, which of the following is described as: "HTTP status completing a WebSocket upgrade"?
- A. 101 Switching Protocols.correct
- B. Ping/pong frames.
- C. Dead letter queue.
- D. Wss://.
Why: 101 Switching Protocols: HTTP status completing a WebSocket upgrade.

WebSocket & Async APIs interview questions — Medium

What this covers

20 example questions

1. "Destination for messages that repeatedly fail processing" — in WebSocket, this describes which of the following?

2. "Definition of an event's structure used for validation" — in WebSocket, this describes which of the following?

3. "HTTP status completing a WebSocket upgrade" — in WebSocket, this describes which of the following?

4. "Keep-alive mechanism verifying the connection is live" — in WebSocket, this describes which of the following?

5. "Mechanism handling consumers slower than producers" — in WebSocket, this describes which of the following?

6. Which statement correctly describes WebSocket?

7. Identify the accurate statement about WebSocket:

8. "Named stream of events consumed by subscribers" — in WebSocket, this describes which of the following?

9. Which of the following statements about WebSocket is TRUE?

10. "TLS-secured WebSocket scheme" — in WebSocket, this describes which of the following?

11. In WebSocket, which of the following is described as: "Definition of an event's structure used for validation"?

12. In WebSocket, which of the following is described as: "Keep-alive mechanism verifying the connection is live"?

13. Which WebSocket concept matches this description: "Definition of an event's structure used for validation"?

14. In the context of WebSocket, which of the following is a correct statement?

15. Which WebSocket concept matches this description: "Destination for messages that repeatedly fail processing"?

16. In WebSocket, which of the following is described as: "Destination for messages that repeatedly fail processing"?

17. Which WebSocket concept matches this description: "Mechanism handling consumers slower than producers"?

18. Which WebSocket concept matches this description: "HTTP status completing a WebSocket upgrade"?

19. In WebSocket, which of the following is described as: "Mechanism handling consumers slower than producers"?

20. In WebSocket, which of the following is described as: "HTTP status completing a WebSocket upgrade"?

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