---
title: "Discussion on \"Testing File Upload Size Boundaries\" | Hashnode"
description: "Discussion on \"Testing File Upload Size Boundaries\". The file that matters is the one whose byte count sits exactly on the limit."
url: "https://hashnode.com/posts/testing-file-upload-size-boundaries/6af72c894facdfb3d0295804"
---

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# [Testing File Upload Size Boundaries](https://blogs.powerduck.com/testing-file-upload-size-boundaries?utm_source=hashnode&utm_medium=feed)

The file that matters is the one whose byte count sits exactly on the limit.

6h ago · 5 min read · blogs.powerduck.com  
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## Written by

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## Responses 1

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[Lakhyajit Changmai](https://hashnode.com/@lakhyajit)

[4h ago](https://hashnode.com/posts/testing-file-upload-size-boundaries/6af72c894facdfb3d0295804/comment/6af73f943b7fa79a4a2fc6e6)

The exact byte-boundary cases are a strong way to make this deterministic. I’d also assert that the client clears its selected-file preview and progress state after a 413, so a retry with a smaller file cannot reuse stale metadata. And your distinction is important: a local mock validates client behavior, while a few genuine uploads are still needed to confirm the gateway’s cap.