![]() ![]() ![]() A workaround for this scenario is to extend the lifetime of the access token, to prevent it from expiring during a user’s session. Some CORS issues can't be resolved, such as when your app redirects to to authenticate, and the access token expires. Option 5: Extend the lifetime of the access token Changing the code is the least recommended option, because it requires the most effort. The way to add the header depends on the app's code language. You can change your app to support CORS by adding the Access-Control-Allow-Origin header, with appropriate values. **Access-Control-Allow-Origin: https\://**\ Server: Microsoft-IIS/8.5 Microsoft-HTTPAPI/2.0\ You can verify it in the Fiddler traces: **Post the Header Addition**\ This modification doesn't require any code changes. For websites running in Internet Information Services (IIS), use IIS Manager to modify the header: The resulting app URLs effectively resolve the CORS issue:Īdd a custom HTTP response header on the web service to match the origin request. Instead, set the Internal URL to publish the parent directory, which includes both the CORSWebClient and CORSWebService directories: When the Internal URL is set to /CORSWebClient, the app can't make successful requests to the /CORSWebService directory, because they're cross-origin. The following examples show the portal Microsoft Entra application proxy page for the CORSWebClient app. Instead of publishing each app separately, you can publish the common parent directory, which results in the same origin. This solution works especially well if you have only two apps on the web server. Publish the parent directory of both apps. Use a Microsoft Entra application proxy custom domain to publish from the same origin, without having to make any changes to app origins, code, or headers. You can resolve the preceding CORS issue in any one of several ways. Solutions for Application Proxy CORS issues An AJAX request from CORSWebClient to CORSWebService is a cross-origin request, and it fails. If you published the CORSWebClient and CORSWebService apps separately as different apps through Application Proxy, the two apps are hosted at different domains. The CORSWebClient app works when you host it on-premises, but either fails to load or errors out when published through Microsoft Entra application proxy. There's an AJAX request from CORSWebClient to CORSWebService. The internal server hosts a CORSWebService web API controller, and a CORSWebClient that calls CORSWebService. The following example shows a typical Microsoft Entra application proxy CORS scenario. In the following screenshot, selecting the Try It button caused a CORS error message that wasn't found in the Access-Control-Allow-Origin header. A CORS violation produces a console error about origin. ![]() ![]() Try to reproduce the transaction, and review the console message.Press F12 to bring up the debug console.Launch the browser and browse to the web app.You can identify CORS issues by using browser debug tools: If the CORS headers are absent or incorrect, cross-origin requests fail. Same-origin policy prevents apps from accessing resources from other origins unless they use the correct access control headers. The following URLs have different origins than the previous two: Two URLs have the same origin if they have identical schemes, hosts, and ports ( RFC 6454), such as: CORS is a W3C standard that lets a server relax the same-origin policy and allow some cross-origin requests while rejecting others. However, sometimes you might want to let other sites call your web API. This restriction is called the same-origin policy, and prevents a malicious site from reading sensitive data from another site. This article discusses Microsoft Entra application proxy CORS issues and solutions.īrowser security usually prevents a web page from making AJAX requests to another domain. Cross-origin resource sharing (CORS) can sometimes present challenges for the apps and APIs you publish through the Microsoft Entra application proxy. ![]()
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