Plack::Middleware::ConditionalGET - Middleware to enable conditional GET

  builder {
      enable "ConditionalGET";
      ....
  };

This middleware enables conditional GET and HEAD using If-None-Match and If-Modified-Since header. The application should set either or both of Last-Modified or ETag response headers per RFC 2616. When either of the conditions is met, the response body is set to be zero length and the status is set to 304 Not Modified.

Rack::ConditionalGet