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Rack::Deflater Middleware for gzipping HTML content

https://www.youtube.com/shorts/aFQ2QeVTvzk

Rack::Deflater will enable gzip compression of html content
on servers where there is no reverse proxy (like Nginx) in front of app server. E.g on Puma on Heroku. 

# config/application.rb
# ...
config.middleware.use Rack::Deflater # gzip content when no reverse proxy (e.g. on Heroku)
#...