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Showing content from https://learn.microsoft.com/en-us/azure/api-management/import-function-app-as-api below:

Import an Azure Function App as an API in API Management - Azure API Management

APPLIES TO: All API Management tiers

Azure API Management supports importing Azure function apps as new APIs or appending them to existing APIs. The process automatically generates a host key in the Azure function app, which is then assigned to a named value in API Management.

Note

Currently, this feature isn't available in workspaces.

This article describes how to import an Azure function app as an API to Azure API Management and test the API.

You'll learn how to:

• Import an Azure function app as an API
• Append an Azure function app to an API
• View the new function app host key and API Management named value
• Test the API in the Azure portal

• Complete the Create an Azure API Management instance quickstart.
• Make sure you have an Azure function app in your subscription. For more information, see Getting started with Azure Functions. The function must have an HTTP trigger. The authorization level must be set to Anonymous or Function.

Note

You can also use the API Management Extension for Visual Studio Code to import and manage your APIs. Complete the API Management Extension tutorial to get started.

To create a new API from an Azure function app:

1. Navigate to your API Management service in the Azure portal.

2. Select APIs > APIs in the left pane.

3. Under Create from Azure resource, select Function App:

4. Select the Browse button:

5. Click the Select button under Configure required settings to choose from the list of available function apps:

6. Find the function app that you want to import functions from, select it, and then click Select:

7. Select the functions that you want to import and click Select. You can only import functions that have an HTTP trigger and an Anonymous or Function authorization level.

8. Switch to the Full view and assign a Product to your new API.

   Note

   Products are associations of one or more APIs that are offered to developers via the developer portal. First, developers must subscribe to a product to get access to the API. When they subscribe, they get a subscription key for any API in the product. If you created the API Management instance, you're an administrator and are subscribed to every product by default.

   In some pricing tiers, API Management instances come with two default sample products:

   • Starter
   • Unlimited

9. As needed, specify other settings. You can also specify settings later via the Settings tab. These settings are explained in the Import and publish your first API tutorial.

10. Select Create.

To append a function app to an existing API:

1. In your Azure API Management service instance, select APIs > APIs in the left pane.

2. Choose an API that you want to import a function app to. Select the ellipsis (...) next to the API, and then select Import:

3. Select the Function App tile:

4. In the Import from Function App window, select Browse:

5. Click the Select button under Configure required settings to choose from the list of available function apps:

6. Find the function app you want to import functions from, select it, and then click Select:

7. Select the functions that you want to import, and then click Select:

8. Select Import:

When you import an Azure function app, these items are automatically generated:

• A host key in the function app. The key is named apim-<your API Management service instance name>.
• A named value in the API Management instance that has the name <your Azure function app instance name>-key. This value contains the host key.

For APIs created after April 4, 2019, the host key is passed in HTTP requests from API Management to the function app in a header. Older APIs pass the host key as a query parameter. You can change this behavior by using the PATCH Backend REST API call on the Backend entity that's associated with the function app.

Warning

Removing or changing either the Azure function app host key value or the API Management named value will disable communication between the services. The values don't automatically sync.

If you need to rotate the host key, be sure to also change the named value in API Management.

1. Navigate to your Azure function app instance:

2. In the Functions section of the left pane, select App keys:

3. Find the keys in the Host keys section:

Navigate to your API Management instance and select APIs > Named values in the left pane. The Azure function app key is stored there.

You can call operations directly from the Azure portal. Using the Azure portal is a convenient way to view and test the operations of an API.

1. Select the API that you created in the preceding section.

2. Select the Test tab.

3. Select the operation that you want to test.

   • The page displays fields for query parameters and headers.
   • One of the headers is Ocp-Apim-Subscription-Key. This header is for the product subscription key that's associated with the API.
   • If you created the API Management instance, you're an administrator, so the key is filled in automatically.

4. Select Send.

   When the test succeeds, the backend responds with 200 OK and some data.

• API import limitations
• Import an OpenAPI specification
• Import a SOAP API
• Import a SOAP API and convert it to REST
• Import an App Service API
• Import a container app API
• Import a WebSocket API
• Import a GraphQL API
• Import a GraphQL schema and set up field resolvers
• Import a function app API
• Import a logic app API
• Import a Service Fabric service
• Import an Azure AI Foundry API
• Import an Azure OpenAI API
• Import an LLM API
• Import an OData API
• Import SAP OData metadata
• Import a gRPC API
• Edit an API

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