[Solved] Why does the API call /items?category=electronics&category=books return only electronics items? — Ans: The API uses the first occurrence of the repeated parameter | Rest API

Rest API - Query Parameters and Filtering

Why does the API call /items?category=electronics&category=books return only electronics items?

AThe API merges both categories automatically

BThe API uses the first occurrence of the repeated parameter

CThe API returns an error for repeated parameters

DThe API uses the last occurrence of the repeated parameter

Step-by-Step Solution

Solution:

Step 1: Understand repeated query parameters behavior
Many APIs take the first or last value when a parameter repeats; here it takes the first.
Step 2: Analyze why only electronics are returned
Since 'category=electronics' appears first, the API filters by electronics only.
Final Answer:
The API uses the first occurrence of the repeated parameter -> Option B
Quick Check:
Repeated params usually use first or last value [OK]

Quick Trick: Avoid repeating query keys; use comma or arrays instead [OK]

Common Mistakes:

MISTAKES

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