Question 1

Why is API rate limiting essential for security?

Accepted Answer

Rate limiting prevents abuse and DDoS attacks by capping the number of requests a user can make. Zuplo provides robust, distributed rate limiting at the edge to stop attacks before they hit your servers.

Question 2

How can I implement tiered rate limiting for different customers?

Accepted Answer

You need to differentiate between free and paid users. Zuplo allows you to easily configure dynamic rate limits based on API keys or user metadata, ensuring premium customers get the throughput they pay for.

Question 3

What happens when a user exceeds their rate limit?

Accepted Answer

Standard behavior is returning a 429 Too Many Requests status. Zuplo handles this automatically and can include 'Retry-After' headers to politely tell the client when they can try again.

Question 4

Does rate limiting work across multiple regions?

Accepted Answer

Yes, but it requires a global state store. Zuplo's rate limiting is globally distributed and synchronized, ensuring that a user cannot bypass limits by simply switching their request region.

Question 5

Can I rate limit based on IP address?

Accepted Answer

Yes. This is a basic defense against anonymous abuse. Zuplo allows you to apply strict rate limits to IP addresses while allowing higher limits for authenticated users with valid API keys.

Question 6

How do I protect specific expensive endpoints?

Accepted Answer

Some endpoints (like AI inference or reports) cost more to run. Zuplo allows you to set granular rate limits on specific routes (e.g., POST /generate-report) independently of global limits.

Question 7

What is the 'Thundering Herd' problem in API gateways?

Accepted Answer

This occurs when many users retry requests simultaneously after a service outage. Zuplo helps mitigate this with intelligent rate limiting and jitter, smoothing out traffic spikes to protect backend stability.

Question 8

Can I use custom logic for rate limiting?

Accepted Answer

Sometimes you need to limit based on complex business rules (e.g., total data transfer vs. request count). Zuplo's programmable environment allows you to write custom logic to increment counters based on any criteria.

Question 9

How does Zuplo ensure rate limiting doesn't slow down valid traffic?

Accepted Answer

Zuplo uses an asynchronous, low-latency counting mechanism at the edge. This ensures that checking the limit adds negligible latency to the request, keeping your API snappy.

Question 10

Can I view analytics on who is hitting their rate limits?

Accepted Answer

Visibility is key to upselling. Zuplo's analytics dashboard shows you exactly which customers are hitting limits, helping you identify users who are ready to upgrade to a higher tier.

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