PowerShell Azure Function Download File

This PowerShell Azure Function will download a file every time it's requested. The file will be downloaded to the path D:\home\data\SitePackages\CatPicture.jpg in an Azure Function App.

In this sample, the HTTP Trigger function will download a picture of a cat from wikipedia.

The following function run.ps1 is responsible to download the image:

using namespace System.Net

# Input bindings are passed in via param block.
param($Request, $TriggerMetadata)

$url = "https://en.wikipedia.org/wiki/File:Cat_poster_1.jpg"
$output = "D:\home\data\SitePackages\CatPicture.jpg"
Invoke-WebRequest -Uri $url -OutFile $output

Create and Deploy a PowerShell Azure Function using the cli

To publish the PowerShell function to Azure Function App, run the following command:

func azure functionapp publish <YourFunctionAppName>

The following Microsoft's documentation has a great step by step teaching how to create a PowerShell function that responds to HTTP requests:

https://docs.microsoft.com/en-us/azure/azure-functions/create-first-function-cli-powershell?tabs=azure-cli%2Cbrowser

How to download files with PowerShell

The blog below explains 3 ways to download files using Powershell and also explains the pros and cons of each solution:

https://blog.jourdant.me/post/3-ways-to-download-files-with-powershell