You can use Fiddler to view and debug HTTP traffic between a client and a host computer.
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Download the Fiddler installer.
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Run the Fiddler installer and follow the
wizard to install Fiddler on your client
machine.
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Stop all other programs and services that
might access the internet or use HTTP. This helps
to obtain a clean and uncluttered trace.
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Select the Fiddler icon in the workstation's Start menu to run Fiddler.
Fiddler starts capturing events as soon as it runs. Fiddler logs all network requests instantly and these requests are summarized in the left-hand pane of the tool.
The individual sections of the Fiddler trace are
color coded. Each color is meaningful, but
failures are shown in red. The result column
contains the HTTP code that the section returned.
For example, if a section returned an HTTP 404 or
Not Found error message, the section would be red.
Since we are typically looking for errors or
failures, the sections we want to concentrate on
are the red sections in the trace. Fiddler creates
a file containing the trace with a file extension
of .saz.