[Solved] Consider this pseudo-code for a fixed window rate limiter with a limit of 3 requests per 10 seconds:window_size = 10limit = 3requests = [timestamp1, timestamp2, timestamp3, timestamp4]If the first... | Rest API

Rest API - Rate Limiting and Throttling

Consider this pseudo-code for a fixed window rate limiter with a limit of 3 requests per 10 seconds:

window_size = 10
limit = 3
requests = [timestamp1, timestamp2, timestamp3, timestamp4]

If the first three requests happen at seconds 1, 5, and 9, and the fourth at second 11, which requests are allowed?

AOnly first three allowed, fourth blocked

BFirst three allowed, fourth allowed (new window)

CAll four allowed

DOnly first two allowed, others blocked

Step-by-Step Solution

Solution:

Step 1: Identify windows for requests
Requests at seconds 1, 5, 9 fall in window 0-10 seconds; fourth at 11 is in next window 10-20 seconds.
Step 2: Check limits per window
First window allows 3 requests, so first three allowed; fourth request is in new window, so allowed.
Final Answer:
First three allowed, fourth allowed (new window) -> Option B
Quick Check:
Requests reset each window = Allowed if under limit [OK]

Quick Trick: Requests reset count after each window ends [OK]

Common Mistakes:

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Consider this pseudo-code for a fixed window rate limiter with a limit of 3 requests per 10 seconds: