Trying to use AWS Lambda as an API? Here’s what you need to know

When using AWS Lambda as an API, there are some hard limits to keep in mind, including a max timeout of 15 minutes and a max response size of 6 MB.

To use Lambda as an API endpoint, it can be coupled with an Application Load Balancer or API Gateway, but the most recent way is using Lambda function URLs, which allow for a 6 MB payload size and a 15-minute timeout. However, using a custom domain with function URLs can be tricky, requiring the creation of a CDN with a CNAME record in Route 53.

CloudFront removes cookies and Set-Cookie headers, but cache key settings can allow cookies to be sent with every request/response.