Dan Brown Origin Bahasa Indonesia Pdf

[Sourn Sanneh]

Recentlyan AWS customer serviced more than 10 billion API calls per day at peak. They needed a failover option for brown-outs and other origin failures. They served these API calls through Amazon CloudFront, a content delivery network (CDN) that securely delivers static and dynamic web content with low latency and high transfer speeds using a global network of edge locations. Initially, we recommended the customer use the CloudFront Origin Failover option, which was built for exactly this purpose. However, after testing the standard solution, the customer wanted the failover to provide a rich, and even personalized, experience. Working with their AWS Solution Architect, a solution was created using Lambda@Edge to evaluate each of the 10 billion API calls. If there was a failure, they were able to provide a rich and personalized failover experience to the end-user.

CloudFront to the rescue. Lambda@Edge is executed on all CloudFront requests (origin request), whether or not there is an error returned from the origin. The logic should only take action when the origin returns an error, which should rarely occur.

The team thought through a possible solution using the Error Pages feature in CloudFront. This feature allows you to set a custom error page and assign a different status code returned to the user. The idea was we could setup a cache behavior in CloudFront that matched the URI path of the error page we configured to handle error pages.

At AWS, we listen to our customers not just for features but also operational pain points, like that above. Within a short period of time the Lambda@Edge and CloudFront engineering teams deployed what seems like a simple fix but solves so many scenarios, like this one.

In one week since delivery, the customer has deployed this new solution using the Lambda@Edge they wrote and tested earlier with a few minor additions to use these new headers. The new solution adds 1/ no additional latency and 2/ no additional Lambda@Edge execution cost until an Error state, while providing that personalized experience on failover.

There are quite a few use cases that can benefit the ability to trigger Lambda@Edge only in case of an error response. Many of the redirects can be done in your application, but if you design a serverless application, it is a great alternative to shift the logic to be handled with Lambda@Edge that is trigged only on error response.

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