I try to constantly to deepen my knowledge of HTTP and REST. Recently, I stumbled upon the list of all registered HTTP Headers. This post is dedicated to the Vary HTTP Header.   The problem   Two years ago, I wrote about web resource caching server-side. The idea is to set up a component between the client and the upstream to cache previously computed results to avoid overloading the latter. Depending on your infrastructure and requirements, this component can be a reverse proxy or an API Gateway

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A Java geek

This post discusses the purpose of the Vary HTTP header and how it solves caching issues by providing a configurable multi-dimensional cache key.

The Vary HTTP header