How does Google Finance update stock prices?

Question

If you use Google Finance, you see the stock price update in real time. However, I do not see ajax requests for each price change. How exactly is it receiving it's data? The ajax calls do happen every so often but not for every price change.

https://www.google.com/finance?q=aapl

Answer 1

It is true that the graph is supplied by flash, but the price of the stock is in HTML and updated in real time.

By looking at the connections, you'll notice that one of the connection stays open. My guess is that it provides the data:

https://www.google.com/finance/qs/channel?VER=8&RID=rpc&SID=628A5B4C83473350&CI=0&AID=0&TYPE=xmlhttp&zx=dcad1i8o61q8&t=1