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Configure cross-origin resource sharing in FHIR service

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What is cross-origin resource sharing in FHIR service?

FHIR® service in Azure Health Data Services 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.

Cross-origin resource sharing configuration settings

To configure a CORS setting in the FHIR service, specify the following settings.

  • Origins (Access-Control-Allow-Origin). A list of domains allowed to make cross-origin requests to the FHIR service. 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 contains. 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 tutorial, we walked through how to configure a CORS setting in the FHIR service. Next, you can review how to pass the CARIN IG for Blue Button tests in Touchstone.

CARIN Implementation Guide for Blue Button®

Note

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