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Diagnosing Intermittent 404s on Azure Static Web Apps

There’s a particular kind of issue that’s more frustrating than something being completely broken: When everything mostly works. I ran into this recently with an Azure Static Web App. The deployment was successful. The default Azure URL worked perfectly. DNS looked correct. And yet, the custom domain would intermittently return a 404. Not always. Just enough to make you question everything. If You’re Seeing Intermittent 404s, Start Here Before going deep, check these in order: ...

December 1, 2025 · 3 min