def call(env)
status, headers, body = @app.call(env)
headers = Utils::HeaderHash.new(headers)
unless should_deflate?(env, status, headers, body)
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."
bp = Rack::BodyProxy.new([message]) { body.close if body.respond_to?(:close) }
[406, {CONTENT_TYPE => "text/plain", CONTENT_LENGTH => message.length.to_s}, bp]
end
end