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Supabase Storage S3 API: AWS Go SDK v2 uploads fail with 403 SignatureDoesNotMatch

This was a Supabase-side S3 signature compatibility bug with the Go SDK v2's signing format. Maintainer itslenny confirmed on the thread that it is fully resolved in production, so the latest SDK works without any workaround. Before the fix, the workaround was to remove the DisableAcceptEncodingGzip…

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GCS signed URLs die with SignatureDoesNotMatch days before expiry

This is by design, not a bug in your code: Google rotates the managed signing keys, so do not generate long-lived signed URLs once and store them. Either refresh them on a schedule (e.g. a scheduled Cloud Function that regenerates URLs every ~160 hours, under the 7-day v4 max), or sign with a user-m…

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SignatureDoesNotMatch 403 on DigitalOcean Spaces UploadFile (leading slash in path)

A leading forward slash on the object path breaks AWS Signature V4 signing against Spaces: UploadFile('/file.txt') fails while UploadFile('file.txt') succeeds. The reporter found this themselves and a second user confirmed the same fix on uploads. Strip any leading '/' from destination paths before …

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