.Net running on-process till dotnet Core 3.1 & dotnet isolated workers are coming on .Net 6 onwards & you can deploy Azure Function Apps in production.
Isolated Models for Workers
In future all Azure Functions will be running in Isolated Model only. Therefore, every Azure Functions will run as isolated worker process.
- New way of building .Net Application called as Isolated Models that decouples the Azure Functions from .Net Function Runtime.
- This gives full control of the process & it’s dependency graph.
- This will be the future of all Azure Functions
- Durable Functions are in the process only.
No more WebJobs Dependency
For each extension you need different set of packages. For Http, Worker and Worker SDK. 
Azure Functions in Isolated models will no more extending WebJobs dependencies. Therefore, you must get all features of WebJobs by adding different set of packages.
Benefits of Isolated Models
- You can debug the host process before even debugger is attached to your functions.
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--dotnet-isolated-deubwill help you to debug very early. It helps to remove race conditions while debugger attaching and the process executing the entry code.
Middleware on Azure Functions
In Azure out of proc Functions you can inject custom code in to the execution/dispatch pipeline. Middleware is a code that you can run before your Azure Functions are executed just like Express Middleware in JavaScript.
- You can modify the response from Middleware
- You can do authentication/ authorizations on Middleware
- Any cross-cutting concerns you can do in Middleware.
What is next in Azure Functions
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