![]() ![]() There are several ways to correct this problem. When a different CORS origin makes another request, the CDN serves the cached Access-Control-Allow-Origin header, which doesn't match. The problem occurs when the CDN caches the Access-Control-Allow-Origin header for the first CORS origin. If you need to allow a specific list of origins to be allowed for CORS, things get a little more complicated. If requests were sent to the Azure Front Door before CORS being set on your origin, you need to purge content on your endpoint content to reload the content with the Access-Control-Allow-Origin header. Azure Front Door caches the first response and ensuing requests use the same header. Wildcard or single origin scenariosĬORS on Azure Front Door works automatically with no extra configuration when the Access-Control-Allow-Origin header is set to wildcard (*) or a single origin. The preflight request asks the server permission if the original CORS request can continue and is an OPTIONS request to the same URL.įor more details on CORS flows and common pitfalls, view the Guide to CORS for REST APIs. For example:Īn HTTP error code such as 403 if the server doesn't allow the cross-origin request after checking the Origin headerĪn Access-Control-Allow-Origin header with a wildcard that allows all origins:Ī complex request is a CORS request where the browser is required to send a preflight request (that is, a preliminary probe) before sending the actual CORS request. The server might respond with any of the following responses:Īn Access-Control-Allow-Origin header in its response indicating which origin site is allowed. When a page from attempts to access a user's data in the origin, the following request header would be sent to : The value of this header is the origin that served the parent page, which is defined as the combination of protocol, domain, and port. The browser sends the CORS request with another Origin HTTP request header. There are two types of CORS requests, simple requests and complex requests. CORS provides a secure way to allow one origin (the origin domain) to call APIs in another origin. This prevents a web page from calling APIs in a different domain. To reduce the possibility of cross-site scripting attacks, all modern web browsers implement a security restriction known as same-origin policy. ![]() What is CORS?ĬORS (Cross Origin Resource Sharing) is an HTTP feature that enables a web application running under one domain to access resources in another domain. Looking for information on Azure Front Door? View here. This documentation is for Azure Front Door Standard/Premium.
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