Envoy Proxy: API Key Validation using HTTP Lua Filters

As a continuation of my previous blog post , I was looking for good examples to further explore Envoy&rsquo;s extension points. During this search, I found an issue on Github asking for a native Envoy Filter to do API Key Validation. I am not very familiar with Envoy&rsquo;s native C++ filters but, as things stand today, we can already solve this problem using a Lua HTTP Filter. This post will…