Define and allow a whitelist of dimensions to be generated and served.For example, WebP on Chrome/Android browsers and JPEG for any other browser. Serve an appropriate image format based on viewer characteristics.Resize images on the fly based on dimensions passed via query parameter.To demonstrate a basic use case, let’s say you want to do the following four things: You can read more details about these triggers in our Developer Guide. The function executes regardless of whether the object is already in the edge cache. CloudFront Viewer Response – The function executes before returning the requested object to the viewer.CloudFront Origin Response – The function executes after CloudFront receives a response from the origin and before it caches the object in the response.When the requested object is in the edge cache, the function doesn’t execute. ![]() ![]() CloudFront Origin Request – The function executes only when CloudFront forwards a request to your origin.CloudFront Viewer Request – The function executes when CloudFront receives a request from a viewer and before it checks to see whether the requested object is in the edge cache.extends the capability of Lambda to the edge by allowing you to run the code in multiple AWS locations closer to the viewer.įor each cache behavior in a Amazon CloudFront distribution, you can add up to four triggers (associations) that cause a Lambda function to execute when one or more of the following CloudFront events occur: Lambda scales automatically and is highly available. You pay only for the compute time you consume – there is no charge when your code is not running. Setting the Scene with Lambda lets you run code without provisioning or managing servers. ![]() To learn more about edge networking with AWS, click here. What if you could just do all these things on the fly, as needed, without having to preprocess each image manually? enables you to do each of these things which will result in a better experience for your users while also reducing the bandwidth usage. Have you ever been in a situation where you have lots of images and you want to modify their dimensions, apply watermark for new design layouts, or optimize their formats based on browser support? *This blog was updated with a new section, Cost and Performance Considerations.
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