If you find yourself needing to monitor the HTTP data stream for troubleshooting, you can use the local HTTP proxy Proxomitron to do it; it has a Log Window feature that displays every HTTP command. Proxomitron itself is not a diagnostic tool, but this feature is there to help diagnose problems with the filters it employs. Go here to get it:
http://www.proxomitron.info/Installing it is easy, since it doesn't INSTALL: just copy it wherever you want it. Since it is a proxy and uses port 8080 by default, a browser will have to be configured to talk to a proxy at "localhost" on that port. If you have no intention of ever using any of the filtering capabilities, you might want to explicitly remove all the default filters, but there is a Bypass button in the main dialog window that does the same.
Once you run it, it will appear in the Windows tool tray. Left-clicking on its icon displays the main dialog window. You will see a button in the lower right quadrant named "Log Window"; that is what you can use to watch an HTTP data stream for clues.
Note that Proxomitron doesn't work with HTTPS unless you take the extra step of installing the OpenSSL addon for it (found at the same site). You'll also want to grab the latest program certificate as well.