https://guerrilla.blog/2026/08/26/building-robust-excel-uploaders-in-python-3-8-without-upgrading/Gustaw Fit Blogen2026-08-26T20:44:49+00:00Building Robust Excel Uploaders in Python 3.8 (Without Upgrading)python, pandas, technology, web development, Boto3, CORS, Pre-signed URLs, AWS S3, Excel Uploads, Python 3.8, SSRF Prevention, Openpyxl, API Gateway, Python Dataclasses, Serverless Architecture, Backend Security, Data Parsing