Question 1

How to use Limiter with the Gin framework?

Accepted Answer

Import the Gin middleware from Limiter, create a limiter instance with a store and rate, then attach it to your Gin router. The README provides a link to an example in the limiter-examples repository for a complete setup.

Question 2

Limiter vs Throttled: which is better for Go rate limiting?

Accepted Answer

Limiter is simpler and has built-in middleware for various frameworks, making it easier for basic use cases. Throttled supports advanced features like burst limiting and the generic cell-rate algorithm but has steeper learning curve and less framework integration out-of-the-box.

Question 3

Does Limiter support rate limiting by user ID instead of IP?

Accepted Answer

Yes, but it requires custom implementation. By default, Limiter uses IP addresses as keys, but you can use a custom KeyGetter in the middleware to extract user IDs from requests, though this adds development overhead.

Question 4

How to handle rate limiting behind Cloudflare with Limiter?

Accepted Answer

Configure Limiter to use the 'CF-Connecting-IP' header by setting the ClientIPHeader option. Ensure your reverse proxy is trusted, as the README warns that spoofed headers can compromise security.

Question 5

What are the performance impacts of using Redis store with Limiter?

Accepted Answer

Redis adds network latency but enables distributed rate limiting across instances. For high-throughput applications, monitor Redis connections and use connection pooling, as the store relies on TTL and incremental updates.

Question 6

Can I use Limiter for API rate limiting with OAuth tokens?

Accepted Answer

Not directly out-of-the-box; you need to implement a custom KeyGetter to parse tokens from request headers. Limiter's default is IP-based, so this requires additional coding for token-based scenarios.

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