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In this article we'll now add another dimension to our measurements : the choice of HTTP Client implementation. This is also interesting, because starting from AWS SDK for Java version 2.22 AWS added support for their own implementation of the synchronous CRT HTTP Client. The asynchronous CRT HTTP client has been generally available since February 2023. In this article we'll explore synchronous HTTP clients first and leave asynchronous ones for the next article.
Let's figure out how to configure the HTTP Client. There are 2 places to do it : pom.xml and DynamoProductDao
The results of the experiment below were based on reproducing more than 100 cold and approximately 100.000 warm starts with experiment which ran for approximately 1 hour. For it (and experiments from my previous article) I used the load test tool hey, but you can use whatever tool you want, like Serverless-artillery or Postman. I ran all these experiments for all 3 scenarios using 2 different compilation options in template.yaml each: