Function behind internet proxy

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How to configure Azure Function App (Flex Consumption Plan) to use corporate proxy (Bluecoat) for outbound internet access?

I’m trying to deploy an Azure Function App (running on the Flex Consumption Plan) with an HTTP trigger. The function app is configured with:
• VNet integration for outbound traffic
• Private endpoint for inbound access

Our environment requires all outbound traffic to go through a corporate internet proxy (Bluecoat).

When I try to deploy my code using either:

func azure functionapp publish or
az functionapp deployment source config-zip ...
The deployment fails, and the Azure portal shows an error stating that the Function App cannot access the Oryx endpoint, which is required for builds.

How can I configure my Azure Function App (Flex Consumption Plan) to route outbound internet traffic through our corporate proxy so it can access the Oryx build service and other necessary endpoints? Is there a supported way to set environment variables like HTTP_PROXY or HTTPS_PROXY, or use VNet features to achieve this?
I tried to configure the But it didn't work

Start with the Flex Consumption deployment paths named in the report: func azure functionapp publish and az functionapp deployment source config-zip. Trace the failure involving access to the Oryx endpoint and review the app's VNet integration, private endpoint, and proxy configuration; done means establishing whether a supported proxy configuration exists for outbound builds and documenting the required setup.

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