Boto3 on CloudKeep https://cloudkeep.io/tags/boto3/ Recent content in Boto3 on CloudKeep Hugo -- gohugo.io en © 2026 Thu, 28 May 2026 00:00:00 +0000 The S3 Presigned URL CORS Gotcha That Will Waste Your Afternoon https://cloudkeep.io/notes/s3-presigned-url-cors/ Wed, 08 Apr 2026 00:00:00 +0000 https://cloudkeep.io/notes/s3-presigned-url-cors/ boto3 generates S3 presigned URLs with a global endpoint that 307-redirects to the regional one — without CORS headers on the redirect.