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 =~ %r\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"
headers['Content-Encoding'] = "gzip"
headers.delete('Content-Length')
mtime = headers.key?("Last-Modified") ?
Time.httpdate(headers["Last-Modified"]) : Time.now
[status, headers, GzipStream.new(body, mtime)]
when "deflate"
headers['Content-Encoding'] = "deflate"
headers.delete('Content-Length')
[status, headers, DeflateStream.new(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