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Contents
# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2019-2023, by Samuel Williams.
require_relative "middleware"
require_relative "body/buffered"
require_relative "body/deflate"
module Protocol
module HTTP
# Encode a response according the the request's acceptable encodings.
class ContentEncoding < Middleware
DEFAULT_WRAPPERS = {
"gzip" => Body::Deflate.method(:for)
}
DEFAULT_CONTENT_TYPES = %r{^(text/.*?)|(.*?/json)|(.*?/javascript)$}
def initialize(app, content_types = DEFAULT_CONTENT_TYPES, wrappers = DEFAULT_WRAPPERS)
super(app)
@content_types = content_types
@wrappers = wrappers
end
def call(request)
response = super
# Early exit if the response has already specified a content-encoding.
return response if response.headers["content-encoding"]
# This is a very tricky issue, so we avoid it entirely.
# https://lists.w3.org/Archives/Public/ietf-http-wg/2014JanMar/1179.html
return response if response.partial?
# Ensure that caches are aware we are varying the response based on the accept-encoding request header:
response.headers.add("vary", "accept-encoding")
# TODO use http-accept and sort by priority
if !response.body.empty? and accept_encoding = request.headers["accept-encoding"]
if content_type = response.headers["content-type"] and @content_types =~ content_type
body = response.body
accept_encoding.each do |name|
if wrapper = @wrappers[name]
response.headers["content-encoding"] = name
body = wrapper.call(body)
break
end
end
response.body = body
end
end
return response
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems