azure-functions-openapi-extension VS azure-functions-proxy

You can probably get some useful information from this page (and related ones): https://github.com/Azure/azure-functions-openapi-extension/blob/main/docs/openapi-core.md

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Since the latest version (0.9.0-preview) of the OpenAPI extension for Azure Functions was released, it supports the byte array types. With this support, you can now define the binary data type like image files onto the OpenAPI document. Throughout this post, I'm going to discuss how to declare the binary data and transfer it through the Azure Functions OpenAPI extension.

Azure security baseline for Azure Functions well describes the security consideration in general while developing an Azure Functions application. In addition to that, Azure Functions offers a built-in authentication method through the functions key. If you use the OpenAPI extension for Azure Functions, you can define the endpoint authentication and authorisation for each API endpoint in various ways. You can even try them through the Swagger UI page. Throughout this post, I'm going to discuss six different approaches for access control to Azure Functions API endpoints using the OpenAPI extension.

Now, suppose, we need to talk to Azure SQL. So, we’d like to add EF Core to the mix. As much as we love to go for latest and greatest, unfortunately it’s a bit messy at the moment. Instead let’s get a bit more conservative and stick to EFCore 3.1.

There is an open issue about this in the Azure repo.

Azure Functions OpenAPI Extensions

Here's the straightforward Azure Function app code. I'm using the Azure Functions OpenAPI extension in this app. It has only one endpoint like below:

In May this year at //Build, Azure Functions OpenAPI support feature (preview) was officially announced. At that time, it supported up to the v3 runtime – .NET Core 3.1 version. Recently, it has released .NET 5 isolated worker supporting package as a preview. Throughout this post, I'm going to review how to use it and deploy it to Azure.

Azure Functions used as the backend API adds the OpenAPI extension, which increases discoverability.

In the following article I am going to show you how to build a dynamic http proxy using Azure Functions and truly little code. If you feel like reading code rather than reading an article about code, go straight to GitHub and have it your way.