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What Happens When You Upload a File to Azure Blob Storage?

Natheem Yousuf
4 min readJan 20, 2025

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Photo by Centre for Ageing Better on Unsplash

When you upload a file to Azure Blob Storage, it might feel like a simple action: drag, drop, and done. But behind the scenes, a sophisticated sequence of events ensures that your data is securely stored, easily accessible, and highly durable. Let’s break it down step by step to uncover the magic behind Azure Blob Storage.

Step 1: The Upload Request

When you initiate an upload — whether through the Azure Portal, an application, or an API — your file is converted into data packets. These packets are sent over the internet using the HTTP or HTTPS protocol to Azure’s servers. HTTPS ensures that your data is encrypted during transmission, protecting it from interception.

Step 2: Routing to an Azure Datacenter

Azure’s global network of datacenters kicks into action. Based on your storage account’s region, the request is routed to the nearest Azure datacenter. This routing ensures low latency and faster upload speeds. Azure’s Content Delivery Network (CDN) and intelligent load balancers help direct traffic efficiently.

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Natheem Yousuf
Natheem Yousuf

Written by Natheem Yousuf

Bridging the gap between ‘It works’ and ‘It scales’

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