The Secret Life of AWS: The Direct Handshake (Amazon S3 Pre-Signed URLs)

📰 Medium · Programming

Learn how to use Amazon S3 pre-signed URLs to securely offload large file downloads from your serverless API, improving performance and reducing costs.

intermediate Published 25 Apr 2026

Action Steps

Create an Amazon S3 bucket and upload a file to it
Generate a pre-signed URL for the file using the AWS SDK
Use the pre-signed URL in your serverless API to offload file downloads
Configure the URL's expiration time and permissions to ensure security
Test the pre-signed URL with a tool like Postman or cURL to verify its functionality

Who Needs to Know This

This tutorial is beneficial for backend developers, DevOps engineers, and cloud architects who want to optimize their serverless API's performance and security. It's especially useful for teams using AWS services like S3 and Lambda.

Key Insight

💡 Pre-signed URLs allow you to grant temporary access to private S3 resources without exposing your AWS credentials, making it a secure and scalable solution for file downloads.