问题
is it possible to determine whether google talk uses tcp or udp packets for transmission. i know it uses the xmpp protocol at the application layer, but does it run over tcp or udp.
回答1:
You can infer what the answer is: Google Talk works in a browser without requiring a plugin. The only protocol supported through the communication mechanism XMLHttpRequest is TCP/HTTP.
If you are interested in XMPP, have a look here.
...wherein a client utilizing XMPP accesses a server over a [TCP] connection, and servers also communicate with each other over TCP connections.
回答2:
You can answer this yourself by using a packet sniffer to watch the traffic. This will be much more instructive than having us tell you the answer.
来源：https://stackoverflow.com/questions/1629582/does-google-talk-use-udp-or-tcp-packets