Update index.js

[BakhshiMoeez]

Adding proper error message incase of invalid or undesired domain reaching out for our API in configuring CORS.

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@BakhshiMoeez please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

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Contributor License Agreement

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[BakhshiMoeez]

@microsoft-github-policy-service agree