# File lib/faraday.rb, line 204 def load_middleware(key) value = fetch_middleware(key) case value when Module value when Symbol, String middleware_mutex do @registered_middleware[key] = const_get(value) end when Proc middleware_mutex do @registered_middleware[key] = value.call end when Array middleware_mutex do const, path = value if root = @middleware_autoload_path path = "#{root}/#{path}" end require(path) @registered_middleware[key] = const end load_middleware(key) end end