rack-headers-filter

https://github.com/htmldrum/rack-headers-filter

The goal of this gem is to avoid depending on potentially forgeable headers down the line by configuring the deploy target properly. Forks https://github.com/pusher/rack-headers_filter to allow more configuration options when initializing the headers. Personally disagree with the restrictive list of headers in this component which is used here in a more general purpose way