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Re:Claude's API now supports CORS requests, enabling client-... by simonw on Friday August 23, 2024 @10:37AM (#41329399)
Lots of replies here talking about cookies and CSRF, but a bigger concern in my opinion is intranets.

If you work somewhere with a network access based intranet you might have eg a private wiki at https://wiki.internal-corp/

Without CORS, anyone from your company visiting a malicious external website could have data stolen from that “private” intranet site using fetch()

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