This how it's done in mod_spdy[1] and App Engine[2], with the X-Associated-Content header. [1]: https://code.google.com/p/mod-spdy/wiki/OptimizingForSpdy#Using

This how it's done in mod_spdy[1] and App Engine[2], with the X-Associated-Content header. [1]: https://code.google.com/p/mod-spdy/wiki/OptimizingForSpdy#Using_SPDY_server_push https://code.google.com/p/mod-spdy/wiki/OptimizingForSpdy#Us... [2]: https://github.com/GoogleChrome/http2push-gae https://github.com/GoogleChrome/http2push-gae