Getting 403 (Forbidden) when uploading to S3 with a signed URL

Question

I\'m trying to generate a pre-signed URL then upload a file to S3 through a browser. My server-side code looks like this, and it generates the URL:

let s3 = new          


        

Answer 1

This code was working with credentials and a bucket I created several years ago, but caused a 403 error on recently created credentials/buckets:

const s3 = new AWS.S3({
  region: region,
  accessKeyId: process.env.AWS_ACCESS_KEY,
  secretAccessKey: process.env.AWS_SECRET_KEY,
})

The fix was simply to add signatureVersion: 'v4'.

const s3 = new AWS.S3({
  signatureVersion: 'v4',
  region: region,
  accessKeyId: process.env.AWS_ACCESS_KEY,
  secretAccessKey: process.env.AWS_SECRET_KEY,
})

Why? I don't know.