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Configure cross-origin resource sharing in Azure API for FHIR

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Important

Azure API for FHIR will be retired on September 30, 2026. Follow the migration strategies to transition to Azure Health Data Services FHIR® service by that date. Due to the retirement of Azure API for FHIR, new deployments won't be allowed beginning April 1, 2025. Azure Health Data Services FHIR service is the evolved version of Azure API for FHIR that enables customers to manage FHIR, DICOM, and MedTech services with integrations into other Azure services.

Azure API for FHIR® supports cross-origin resource sharing (CORS). CORS allows you to configure settings so that applications from one domain (origin) can access resources from a different domain, known as a cross-domain request.

CORS is often used in a single-page app that must call a RESTful API to a different domain.

Configure CORS settings

To configure a CORS setting in the Azure API for FHIR, specify the following settings.

  • Origins (Access-Control-Allow-Origin). A list of domains allowed to make cross-origin requests to the Azure API for FHIR. Each domain (origin) must be entered in a separate line. You can enter an asterisk (*) to allow calls from any domain, but we don't recommend it because it's a security risk.

  • Headers (Access-Control-Allow-Headers). A list of headers that the origin request will contain. To allow all headers, enter an asterisk (*).

  • Methods (Access-Control-Allow-Methods). The allowed methods (PUT, GET, POST, and so on) in an API call. Choose Select all for all methods.

  • Max age (Access-Control-Max-Age). The value in seconds to cache preflight request results for Access-Control-Allow-Headers and Access-Control-Allow-Methods.

  • Allow credentials (Access-Control-Allow-Credentials). CORS requests normally don’t include cookies to prevent cross-site request forgery (CSRF) attacks. If you select this setting, the request can be made to include credentials, such as cookies. You can't configure this setting if you already set Origins with an asterisk (*).

Cross-origin resource sharing (CORS) settings

Note

You can't specify different settings for different domain origins. All settings (Headers, Methods, Max age, and Allow credentials) apply to all origins specified in the Origins setting.

Next steps

In this article, you learned how to configure cross-origin resource sharing in Azure API for FHIR. For more information about deploying Azure API for FHIR, see

Deploy Azure API for FHIR

Note

FHIR® is a registered trademark of HL7 and is used with the permission of HL7.