CODEWITHSUNDEEP
node.jsamazon-web-servicesaws-lambdaamazon-cloudfrontaws-lambda-edge
Virendra Sharma
Virendra Sharma

Reputation: 15

I want to change the URL from AWS CloudFront with the help of AWS lambda

I have this an URL, let's assume, "www.sample.com/hello". Now I have triggered a lambda function on viewer request where I just need to change the url to "www.sample.com/hello2". I did it using lambda edge functions but it is throwing me an error.

This is the code I wrote in lamda

const path = require('path');



exports.handler = (event, context, callback) => {
        const cf = event.Records[0].cf;
    const request = cf.request;
    const response = cf.response;
    const statusCode = response.status;
    const path = request.uri;
    const afterpath = path.substring(path.indexOf("/")+1);

if (afterpath == 'sample') {
    request.uri = request.uri
        .replace(afterpath,'samplepathitis')
}

    return callback(null, request);
};

I am getting this error

503 ERROR
The request could not be satisfied.
The Lambda function associated with the CloudFront distribution is invalid 
or doesn't have the required permissions. 
If you received this error while trying to use an app or access a website, 
please contact the provider or website owner for assistance. 
If you provide content to customers through CloudFront, you can find steps 
to troubleshoot and help prevent this error by following steps in the 
CloudFront documentation 
(http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/http- 
503-service-unavailable.html). 
Generated by cloudfront (CloudFront)
Request ID: MsN6aG8qvI9ttt3_VLhQAqpY8kF2pHk3V095lAFVU_sWmDvF3IfqAA==

Upvotes: 0

Views: 2157

Answers (1)

Sébastien Stormacq
Sébastien Stormacq

Reputation: 14905

As the error message states it clearly : either the function is invalid or there is no permission to call the function.

To check if the function is valid : try to invoke it from the Lamba console. Use the Test button. You will need to pass a request as input. The console will propose you sample request that you can adjust to simulate your use case.

Also very in the doc the return value of the function. Is request the correct return value expected by Cloudfront ?

Once you are sure about the two above, verify the permission to invoke that function. What is the trigger ? Is Cloudfront authorized to invoke your function ?

Upvotes: 1

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