CORS Reference

Overview

Cross-Origin Resources Sharing (CORS) provide a mechanism to control permission to resources on a server on a different domain or origin than the originating request. Practically, this means that in order to make HTTP requests in JavaScript to FusionAuth when the request is coming from a different domain, CORS needs to be configured to allow the request.

Most of the time this works as designed, you do not need to think much about CORS configuration. In some cases you may find the configuration is restricting the way you want to use FusionAuth. If this happens FusionAuth allows you to modify or disable the CORS filter.

Configuration

Available Since Version 1.8.0.

To modify the default CORS configuration navigate to Settings → System → CORS. Please utilize caution when modifying this configuration, with great power comes great responsibility.

CORS Configuration

Form Fields

Enabled

When enabled, the CORS filter will process requests made to FusionAuth.

Allow credentials

The Access-Control-Allow-Credentials response header values as described by MDN Access-Control-Allow-Credentials.

Allowed headers

The Access-Control-Allow-Headers response header values as described by MDN Access-Control-Allow-Headers.

Allowed methods

The Access-Control-Allow-Methods response header values as described by MDN Access-Control-Allow-Methods.

Allowed origins

The Access-Control-Allow-Origin response header values as described by MDN Access-Control-Allow-Origin. If the wildcard * is specified, no additional domains may be specified.

Exposed headers

The Access-Control-Expose-Headers response header values as described by MDN Access-Control-Expose-Headers.

Preflight max age

The Access-Control-Max-Age response header values as described by MDN Access-Control-Max-Age.

Debug enabled Available since 1.25.0

Enable debug to create an event log to assist you in debugging 403 HTTP response codes. When enabled, a Debug event log will be created when the FusionAuth CORS filter returns a 403 detailing the reason for the response to assist you in configuration.

CORS Excluded URI Paths

We have excluded some paths from FusionAuth CORS filtering in order to force same-origin browser requests on these paths. The following are the URL patterns excluded from our CORS filter.

  • /account*

  • /admin*

  • /support*

  • /ajax*

Default Configuration

The following reference has been provided in case you want to return the CORS filter configuration to the original values provided by FusionAuth.

Default Configuration

Enabled

true

Allow credentials

false

Allowed headers

Accept, Access-Control-Request-Headers, Access-Control-Request-Method, Authorization, Content-Type, Last-Modified, Origin, X-FusionAuth-TenantId, X-Requested-With

Allowed methods

  • GET

  • OPTIONS

Allowed origins

None

Exposed headers

  • Access-Control-Allow-Origin

  • Access-Control-Allow-Credentials

Preflight max age

1800

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