def call(env)
status, headers, body = @app.call(env)
headers = Utils::HeaderHash.new(headers)
if Utils::STATUS_WITH_NO_ENTITY_BODY.include?(status) ||
headers['Cache-Control'].to_s =~ /\bno-transform\b/
return [status, headers, body]
end
request = Request.new(env)
encoding = Utils.select_best_encoding(%w(gzip deflate identity),
request.accept_encoding)
vary = headers["Vary"].to_s.split(",").map { |v| v.strip }
unless vary.include?("*") || vary.include?("Accept-Encoding")
headers["Vary"] = vary.push("Accept-Encoding").join(",")
end
case encoding
when "gzip"
mtime = if headers.key?("Last-Modified")
Time.httpdate(headers["Last-Modified"])
else
Time.now
end
[status,
headers.merge("Content-Encoding" => "gzip"),
self.class.gzip(body, mtime)]
when "deflate"
[status,
headers.merge("Content-Encoding" => "deflate"),
self.class.deflate(body)]
when "identity"
[status, headers, body]
when nil
message = ["An acceptable encoding for the requested resource #{request.fullpath} could not be found."]
[406, {"Content-Type" => "text/plain"}, message]
end
end