We're running into some CORS errors, and after searching the posts here I haven't found a match.

Access to XMLHttpRequest at '<url>' from origin '<https://localhost:3000>' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.

Hello Adam! Could you please tell us what are you trying to achieve? I assume you are running the GoodData.CN Community Edition, correct? And you are trying to connect to it from a GoodData.UI web application? Please provide more information like domains and hosts so that we can assist. Thanks!

We used the accelerator toolkit to make a tiger application. This CORS error is occurring when we try to request an insight from the CN endpoint.

Hello Adam! I just tested myself. The command

npx --ignore-existing @gooddata/create-gooddata-react-app --backend=tiger

installed a web application boilerplate with GoodData.UI version 8.8.0, and I'm running it against a GoodData.CN CE instance version 1.6.0. By default, the GD.CN instance runs at http://localhost:3000/, and the web app runs at http://localhost:8443. Since the domain is simply

localhost

for both, there were no CORS issues and I was able to render a

<Headline />

component without problems.