Lower case normalization benchmark.

examples/header-lowercase/benchmark.rb

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+require 'benchmark/ips'
+
+class NormalizedHeaders
+	def initialize(fields)
+		@fields = fields
+	end
+
+	def [](key)
+		@fields[key.downcase]
+	end
+end
+
+class Headers
+	def initialize(fields)
+		@fields = fields
+	end
+
+	def [](key)
+		@fields[key]
+	end
+end
+
+FIELDS = {
+	'content-type' => 'text/html',
+	'content-length' => '127889',
+	'accept-ranges' => 'bytes',
+	'date' => 'Tue, 14 Jul 2015 22:00:02 GMT',
+	'via' => '1.1 varnish',
+	'age' => '0',
+	'connection' => 'keep-alive',
+	'x-served-by' => 'cache-iad2125-IAD',
+}
+
+NORMALIZED_HEADERS = NormalizedHeaders.new(FIELDS)
+HEADERS = Headers.new(FIELDS)
+
+Benchmark.ips do |x|
+	x.report('NormalizedHeaders[Content-Type]') { NORMALIZED_HEADERS['Content-Type'] }
+	x.report('NormalizedHeaders[content-type]') { NORMALIZED_HEADERS['content-type'] }
+	x.report('Headers') { HEADERS['content-type'] }
+
+	x.compare!
+end