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By default, the Cross-Origin Resource Sharing (CORS) is disabled for REST API. To enable it, configure a list of origins that are allowed to access your REST API resources via Resources/config/oro/app.yml in any bundle or config/config.yml of your application, e.g.:
oro_api: cors: allow_origins: - 'https://example.com'
You can also configure other CORS options. Here is the default configuration:
oro_api: cors: # The amount of seconds the user agent is allowed to cache CORS preflight requests. preflight_max_age: 600 # The list of origins that are allowed to send CORS requests. allow_origins:  # Indicates whether CORS request can include user credentials. # This option determines whether the "Access-Control-Allow-Credentials" response header # should be passed within CORS requests. allow_credentials: false # The list of headers that are allowed to send by CORS requests. # This option specifies a list of headers that are sent # in the "Access-Control-Allow-Headers" response header of CORS preflight requests allow_headers:  # The list of headers that can be exposed by CORS responses. # This option specifies a list of headers that are sent # in the "Access-Control-Expose-Headers" response header of CORS requests expose_headers: