Support headers passed in using string keys when Vary header is in a different case #25

	name: Test Ruby

	on:
	push:
	branches:
	- master

	pull_request:

	jobs:
	rspec:
	runs-on: ubuntu-latest
	env:
	BUNDLE_JOBS: 4
	BUNDLE_RETRY: 3
	FARADAY_VERSION: ${{ matrix.faraday }}
	FARADAY_ADAPTER: ${{ matrix.faraday_adapter }}
	ACTIVESUPPORT_VERSION: ${{ matrix.activesupport }}
	strategy:
	fail-fast: false
	matrix:
	ruby: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1']
	faraday_adapter: [net_http, em_http]
	faraday: ['~> 0.8.0', '~> 0.15.0', '~> 0.17.3', '~> 1.0', '~> 2.0']
	exclude:
	# Faraday 2 requires Ruby 2.6+
	- ruby: '2.5'
	faraday: '~> 2.0'
	- ruby: '2.4'
	faraday: '~> 2.0'
	# Ruby 3.0+ requires Faraday >= 0.17.3
	- ruby: '3.0'
	faraday: '~> 0.8.0'
	- ruby: '3.0'
	faraday: '~> 0.15.0'
	- ruby: '3.1'
	faraday: '~> 0.8.0'
	- ruby: '3.1'
	faraday: '~> 0.15.0'
	# faraday-em_http does not support Faraday 2.0+
	- faraday: '~> 2.0'
	faraday_adapter: em_http

	steps:
	- uses: actions/checkout@v2
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	- name: Run RSpec
	run: bundle exec rspec

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