With each release, the binary for LLRT (the Lambda Low Latency Runtime) has been increasing in size. It gains important new features and functionality, but if you don't use those features, they add bloat. In this post, I'll show you how to build a custom LLRT binary with only the dependencies you use to claw back some of the bloat and reduce your coldstart latency.
If you use Lambda Function URLs to front your serverless API, you will receive traffic from crawlers, scrapers, bots and vulnerability sniffers that generates unnecessary errors. In this article, I'll cover how I use CloudFront and CloudFront Functions to block that traffic at the edge so it never reaches your Lambda API metrics and logs.
If you use Lambda Function URLs and are extracting the caller's ip address from the x-forwarded-for header, that ip can be spoofed. In this article, I'll describe the scenarios where Lambda mangles this header and a workaround to get the caller's true ip address. Since several frameworks rely on the x-forwarded-for to determine the caller's ip address, your caller's ip address may be wrong!
Another 365 in the bag. Last year I migrated to newer technologies and made some incremental speed related discoveries. Let's get to it!