Restrict azure function to outgoing requests

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I need restrict my Functions in azure functionApp so they could't perform any outgoing requests(like get forecast from website, get some data from Blob storage) so it will be fully isolated. How I can do it?

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For that you will need to use premium plan, add your function into network then in function app add application property WEBSITE_VNET_ROUTE_ALL=1 which will force to send outbound traffic via network where you can configure all security rules you want

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