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Enable CORS policies for API Management custom connector

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APPLIES TO: All API Management tiers

Cross-origin resource sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources. Customers can add a CORS policy to their web APIs in Azure API Management, which adds cross-origin resource sharing support to an operation or an API to allow cross-domain calls from browser-based clients.

If you've exported an API from API Management as a custom connector in the Power Platform and want to use browser-based clients including Power Apps or Power Automate to call the API, you need to configure your API to explicitly enable cross-origin requests from Power Platform applications. This article shows you how to configure the following two necessary policy settings:

  • Add a CORS policy to your API

  • Add a policy to your custom connector that sets an Origin header on HTTP requests

Prerequisites

Add CORS policy to API in API Management

Follow these steps to configure the CORS policy in API Management.

  1. Sign in to the Azure portal and go to your API Management instance.
  2. In the left menu, select APIs and select the API that you exported as a custom connector. If you want to, select only an API operation to apply the policy to.
  3. In the Policies section, in the Inbound processing section, select + Add policy.
    1. Select Allow cross-origin resource sharing (CORS).
    2. Add the following Allowed origin: https://make.powerapps.com.
    3. Select Save.
  • For more information about configuring a policy, see Set or edit policies.
  • For details about the CORS policy, see the cors policy reference.

Note

If you already have an existing CORS policy at the service (all APIs) level to enable the test console of the developer portal, you can add the https://make.powerapps.com origin to that policy instead of configuring a separate policy for the API or operation.

Note

Depending on how the custom connector gets used in Power Platform applications, you might need to configure additional origins in the CORS policy. If you experience CORS problems when running Power Platform applications, use developer tools in your browser, tracing in API Management, or Application Insights to investigate the issues.

Add policy to custom connector to set Origin header

Add the following policy to your custom connector in your Power Platform environment. The policy sets an Origin header to match the CORS origin you allowed in API Management.

For details about editing settings of a custom connector, see Create a custom connector from scratch.

  1. Sign in to Power Apps or Power Automate.

  2. On the left pane, select Data > Custom Connectors.

  3. Select your connector from the list of custom connectors.

  4. Select the pencil (Edit) icon to edit the custom connector.

  5. Select 3. Definition.

  6. In Policies, select + New policy. Select or enter the following policy details.

    Setting Value
    Name A name of your choice, such as set-origin-header
    Template Set HTTP header
    Header name Origin
    Header value https://make.powerapps.com (same URL that you configured in API Management)
    Action if header exists override
    Run policy on Request

    Screenshot of creating policy in Power Platform custom connector to set an Origin header in HTTP requests.

  7. Select Update connector.

  8. After setting the policy, go to the 5. Test page to test the custom connector.

Next steps