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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2020-2025, by Samuel Williams.
require_relative "split"
module Protocol
module HTTP
module Header
# Represents the `vary` header, which specifies the request headers a server considers when determining the response.
#
# The `vary` header is used in HTTP responses to indicate which request headers affect the selected response. It allows caches to differentiate stored responses based on specific request headers.
class Vary < Split
# Parses a raw header value.
#
# @parameter value [String] a raw header value containing comma-separated header names.
# @returns [Vary] a new instance with normalized (lowercase) header names.
def self.parse(value)
self.new(value.downcase.split(COMMA))
end
# Coerces a value into a parsed header object.
#
# @parameter value [String | Array] the value to coerce.
# @returns [Vary] a parsed header object with normalized values.
def self.coerce(value)
case value
when Array
self.new(value.map(&:downcase))
else
self.parse(value.to_s)
end
end
# Adds one or more comma-separated values to the `vary` header. The values are converted to lowercase for normalization.
#
# @parameter value [String] a raw header value containing one or more values separated by commas.
def << value
super(value.downcase)
end
end
end
end
end
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