If CacheInterceptor is applied globally in a NestJS app, what will happen when the /products endpoint is called twice consecutively?

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NestJS - Interceptors

If CacheInterceptor is applied globally in a NestJS app, what will happen when the /products endpoint is called twice consecutively?

ABoth calls execute the handler and return fresh data

BThe first call fetches fresh data; the second returns cached data without executing the handler

CThe second call throws an error due to cache conflicts

DThe cache is cleared after each request, so both calls fetch fresh data

Step-by-Step Solution

Solution:

Step 1: Understand global CacheInterceptor behavior
When applied globally, CacheInterceptor caches responses after the first request.
Step 2: Analyze repeated calls
The first call executes the handler and caches the response; the second call returns cached data without re-executing the handler.
Final Answer:
The first call fetches fresh data; the second returns cached data without executing the handler -> Option B
Quick Check:
Global CacheInterceptor caches first response, serves cached on second [OK]

Quick Trick: First request caches; second serves cached response [OK]

Common Mistakes:

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