Download-FileFromWebApp.ps1

function Download-FileFromWebApp($resourceGroupName, $webAppName, $slotName = "", $kuduPath, $localPath){

    $kuduApiAuthorisationToken = Get-KuduApiAuthorisationHeaderValue $resourceGroupName $webAppName $slotName
    if ($slotName -eq ""){
        $kuduApiUrl = "https://$webAppName.scm.azurewebsites.net/api/vfs/site/wwwroot/$kuduPath"
    }
    else{
        $kuduApiUrl = "https://$webAppName`-$slotName.scm.azurewebsites.net/api/vfs/site/wwwroot/$kuduPath"
    }
    $virtualPath = $kuduApiUrl.Replace(".scm.azurewebsites.", ".azurewebsites.").Replace("/api/vfs/site/wwwroot", "")
    Write-Host " Downloading File from WebApp. Source: '$virtualPath'. Target: '$localPath'..." -ForegroundColor DarkGray

    Invoke-RestMethod -Uri $kuduApiUrl `
                        -Headers @{"Authorization"=$kuduApiAuthorisationToken;"If-Match"="*"} `
                        -Method GET `
                        -OutFile $localPath `
                        -ContentType "multipart/form-data"
}