Stop wireshark packet capture.First, find the packet numbers
(the leftmost column in the upper Wireshark window)
of the HTTP GET message that was sent from your computer to gaia.cs.umass.edu,as well as the beginning of the HTTP response message sent to your computer by gaia.cs.umass.edu
You should see a screen that looks something like this(where packet 4 in the screenshot below contains the HTTP GET message)