Developer speak for the moment you stop everything to diagnose whether a Cross-Origin Resource Sharing policy is blocking your API calls. A cors check is the digital equivalent of checking whether the bouncer at the door is going to let your request through. Frontend devs learn early that CORS errors are cryptic, loud, and always seem to hit right before a deadline. Doing a cors check means inspecting headers, reading error logs, and praying that the fix is something simple like adding a missing 'Access-Control-Allow-Origin' header rather than something deeply architectural.
Hold on, I need to do a cors check — the fetch is failing and I'm pretty sure the backend isn't allowing cross-origin requests.
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