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 = headers.key?("Last-Modified") ?
Time.httpdate(headers["Last-Modified"]) : Time.now
body = self.class.gzip(body, mtime)
size = Rack::Utils.bytesize(body)
headers = headers.merge("Content-Encoding" => "gzip", "Content-Length" => size.to_s)
[status, headers, [body]]
when "deflate"
body = self.class.deflate(body)
size = Rack::Utils.bytesize(body)
headers = headers.merge("Content-Encoding" => "deflate", "Content-Length" => size.to_s)
[status, headers, [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", "Content-Length" => message.length.to_s}, [message]]
end
end