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Which of the following is the correct sequence for entry and exit flow in a typical web service?

easy🧠 Conceptual Q3 of 15
LLD - Design — Parking Lot System
Which of the following is the correct sequence for entry and exit flow in a typical web service?
AClient request -> API Gateway -> Processing Service -> Response to Client
BProcessing Service -> API Gateway -> Client request -> Response to Client
CResponse to Client -> Processing Service -> API Gateway -> Client request
DAPI Gateway -> Response to Client -> Client request -> Processing Service
Step-by-Step Solution
Solution:

  1. Step 1: Understand typical flow order

    Requests come from client, pass through API Gateway (entry), then processing, then response (exit) back to client.

  2. Step 2: Verify option sequences

    Only Client request -> API Gateway -> Processing Service -> Response to Client follows the correct order: Client request -> API Gateway -> Processing -> Response.

  3. Final Answer:

    Client request -> API Gateway -> Processing Service -> Response to Client -> Option A

  4. Quick Check:

    Correct flow sequence = Client request -> API Gateway -> Processing Service -> Response to Client [OK]
Quick Trick: Entry flow always precedes processing, exit flow follows [OK]
Common Mistakes:
MISTAKES
  • Reversing request and response order
  • Placing response before processing
  • Confusing API Gateway position

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