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Ruby on Rails: Minify HTML, CSS, & JS, and compress with gzip
# config/initializers/compression.rb
Rails.application.configure do
# Use environment names or environment variables:
# break unless Rails.env.production?
break unless ENV['ENABLE_COMPRESSION'] == '1'
# Strip all comments from JavaScript files, even copyright notices.
# By doing so, you are legally required to acknowledge
# the use of the software somewhere in your Web site or app:
uglifier = output: { comments: :none }
# To keep all comments instead or only keep copyright notices (the default):
# uglifier = output: { comments: :all }
# uglifier = output: { comments: :copyright }
config.assets.compile = true
config.assets.debug = false
config.assets.js_compressor = uglifier
config.assets.css_compressor = :sass
config.middleware.use Rack::Deflater
config.middleware.insert_before ActionDispatch::Static, Rack::Deflater
config.middleware.use HtmlCompressor::Rack,
compress_css: true,
compress_javascript: true,
css_compressor: Sass,
enabled: true,
javascript_compressor: uglifier,
preserve_line_breaks: false,
remove_comments: true,
remove_form_attributes: false,
remove_http_protocol: false,
remove_https_protocol: false,
remove_input_attributes: true,
remove_intertag_spaces: false,
remove_javascript_protocol: true,
remove_link_attributes: true,
remove_multi_spaces: true,
remove_quotes: true,
remove_script_attributes: true,
remove_style_attributes: true,
simple_boolean_attributes: true,
simple_doctype: false
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