---
title: "Discussion on \"Why Increasing Concurrency Causes HTTP 429 Errors (It’s Not Just Too Many Requests)\" | Hashnode"
description: "Discussion on \"Why Increasing Concurrency Causes HTTP 429 Errors (It’s Not Just Too Many Requests)\". This guide shows how start-rate bursts, per-host concurrency, and rate limits — not just worker count — determine real throughput."
url: "https://hashnode.com/posts/why-increasing-concurrency-causes-http-429-errors/6a5fa6914acafaf1359f90ff"
---

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Discussion

# [Why Increasing Concurrency Causes HTTP 429 Errors (It’s Not Just Too Many Requests)](https://prithwish-nath.hashnode.dev/why-increasing-concurrency-causes-http-429-errors?utm_source=hashnode&utm_medium=feed)

This guide shows how start-rate bursts, per-host concurrency, and rate limits — not just worker count — determine real throughput.

Jul 21 · 21 min read · prithwish-nath.hashnode.dev  
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## Written by

[Prithwish Nath](https://hashnode.com/@prithwish-nath)

@prithwish-nath

  
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Fullstack developer, audiophile, strategy game enthusiast.

Fullstack developer, audiophile, strategy game enthusiast.

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