As I understand it, in SPDY push the server serves up an HTML doc, looks at it before sending it, and decides I need images/css resources X Y and Z, so sends them over as well.
How does it know to not bother, if they're already cached by my browser? Or is there basically no point in trying to cache static resources if your clients are using spdy/3 browsers?
(Obviously not every client will be, but i'm interested for this case)