[Solved] Identify the logical error in this per-IP rate limiting pseudocode:requests = {"123.45.67.89": 4} limit = 5 ip = "123.45.67.89" if requests[ip] > limit: block() else: allow() requests[ip] += 1 | Rest API

Rest API - Rate Limiting and Throttling

Identify the logical error in this per-IP rate limiting pseudocode:

requests = {"123.45.67.89": 4}
limit = 5
ip = "123.45.67.89"
if requests[ip] > limit:
    block()
else:
    allow()
requests[ip] += 1

AIncrementing requests[ip] after the check causes off-by-one errors

BUsing > instead of >= in the if condition is incorrect

CThe IP address key is missing from the requests dictionary

DThe limit variable should be a dictionary, not a single value

Step-by-Step Solution

Solution:

Step 1: Review the order of operations
The request count is checked before incrementing, so the current request isn't counted.
Step 2: Identify the impact
This causes the system to allow one extra request beyond the limit.
Final Answer:
Incrementing requests[ip] after the check causes off-by-one errors -> Option A
Quick Check:
Increment before checking to avoid off-by-one [OK]

Quick Trick: Increment count before limit check [OK]

Common Mistakes:

MISTAKES

Master "Rate Limiting and Throttling" in Rest API

9 interactive learning modes - each teaches the same concept differently

More Rest API Quizzes

Identify the logical error in this per-IP rate limiting pseudocode: