![]() If a request matches an operation with an OPTIONS method defined in the API, preflight request processing logic associated with the cors policy will not be executed. ![]() Refer to the developer portal documentation for details. Only requests using the GET and HEAD methods and a limited set of request headers are allowed.Ĭonfigure the cors policy in API Management for the following scenarios:Įnable the interactive test console in the developer portal. ![]() Simple requests - These requests include one or more extra Origin headers but don't trigger a CORS preflight. If the server response includes the Access-Control-Allow-Origin header that allows access, the browser follows with the actual request. Preflighted (or "preflight") requests - The browser first sends an HTTP request using the OPTIONS method to the server, to determine if the actual request is permitted to send. This allows for more flexibility than only allowing same-origin requests, but is more secure than allowing all cross-origin requests.ĬORS specifies two types of cross-origin requests: Remaining configured policies are evaluated on the approved request.ĬORS is an HTTP header-based standard that allows a browser and a server to interact and determine whether or not to allow specific cross-origin requests ( XMLHttpRequest calls made from JavaScript on a web page to other domains). Only the cors policy is evaluated on the OPTIONS request during preflight.Ensure that the base element is configured at the operation, API, and product scopes to inherit needed policies at the parent scopes. You may configure the cors policy at more than one scope (for example, at the product scope and the global scope).Gateways: dedicated, consumption, self-hosted.Policy scopes: global, product, API, operation.Policy expressions are allowed.Īt least one method element is required if the allowed-methods section is present.Īt least one header element is required in allowed-headers if that section is present.Īt least one header element is required in expose-headers if that section is present. The Access-Control-Max-Age header in the preflight response will be set to the value of this attribute and affect the user agent's ability to cache the preflight response. If the port is omitted in a URI, port 80 is used for HTTP and port 443 is used for HTTPS. The URI must include a scheme, host, and port. The value can be either * to allow all origins, or a URI that specifies a single origin. This configuration may be overly permissive and may make an API more vulnerable to certain API security threats. Use the * wildcard with care in policy settings. This element contains header elements specifying names of the headers that will be accessible by the client. This element contains header elements specifying names of the headers that can be included in the request. If this section isn't present, GET and POST are supported. Contains method elements that specify the supported HTTP verbs. This element is required if methods other than GET or POST are allowed. allowed-origins can contain either a single origin element that specifies * to allow any origin, or one or more origin elements that contain a URI. If the attribute is set to false, allow the request to proceed normally and don't add CORS headers to the response.Ĭontains origin elements that describe the allowed origins for cross-domain requests. ![]() ![]() When GET or HEAD request includes the Origin header (and therefore is processed as a simple cross-origin request), and doesn't match policy settings: - If the attribute is set to true, immediately terminate the request with an empty 200 OK response. If no cors policies are found, terminate the request with an empty 200 OK response. When OPTIONS request is processed as a preflight request and Origin header doesn't match policy settings: - If the attribute is set to true, immediately terminate the request with an empty 200 OK response - If the attribute is set to false, check inbound for other in-scope cors policies that are direct children of the inbound element and apply them. Policy expressions are allowed.Ĭontrols the processing of cross-origin requests that don't match the policy settings. The Access-Control-Allow-Credentials header in the preflight response will be set to the value of this attribute and affect the client's ability to submit credentials in cross-domain requests. Learn more about how to set or edit API Management policies. To help you configure this policy, the portal provides a guided, form-based editor. Set the policy's elements and child elements in the order provided in the policy statement. ![]()
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