(We’re only interested in the HTTP protocol here, and don’t want to see the clutter of all captured packets). Enter “http” (just the letters, not the quotation marks) in the display-filter-specification window, so that only captured HTTP messages will be displayed later in the packet-listing window. Start up the Wireshark packet sniffer, as described in the Introductory lab (but don’t yet begin packet capture). Let’s begin our exploration of HTTP by downloading a very simple HTML file – one that is very short, and contains no embedded objects.
Before beginning these labs, you might want to review Section 2.2 of the text. In this lab, we’ll explore several aspects of the HTTP protocol: the basic GET/response interaction, HTTP message formats, retrieving large HTML files, retrieving HTML files with embedded objects, and HTTP authentication and security. Having gotten our feet wet with the Wireshark packet sniffer in the introductory lab, we’re now ready to use Wireshark to investigate protocols in operation.
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