Lambda function 301 redirects

Using lambda function 301 redirects from a www subdomain to the root domain is common practice , in this post I’ll show how this is done with Lambda functions in a serverless architecture.

Step 1

Step 2

Step 3

I’ve posted this scripts below (with comments) so you can now use lambda function 301 redirects. I’ve also written a similar post to this on how to solve an obsure rooting issue with cloudfront, that you may find helpful! Enjoy! 😀

Lambda function

exports.handler = async (event) => {
 // get the request
  const request = event.Records[0].cf.request;

  // if the headers of that address contain www.jamesmiller.blog
  if (request.headers.host[0].value === 'www.jamesmiller.blog') {
    // return the new set of headers containing the redirect
    return {
      status: '301',
      statusDescription: `Redirecting to apex domain`,
      headers: {
        location: [{
          key: 'Location',
          value: `https://jamesmiller.blog${request.uri}`
        }]
      }
    };
  }
  
  return request;
};

Lambda permission role’s trust relationship

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": [
          "lambda.amazonaws.com",
          "edgelambda.amazonaws.com"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

James Miller

Creative Technologist