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How to Cut Outbound API Latency in Rails with HTTP Connection Pooling

Marko M.9 min readMay 27, 2026Technology

Marko M.9 min read

Contents:

A quick analogy: AR pool vs HTTP pool

What "pooling" means for HTTP

When to use HTTP connection pooling in Rails

How do you know you need this?

Common code smells

The minimal approach: Keep-alive + sensible timeouts

Stepping up: Wrapping a client in connection_pool

Observability: Make the pool visible

Sizing the pool: threads, workers, and math

Production pitfalls worth knowing

Wrapping up

Spread the word:

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