If you use the FireFox or Mozilla web browser, you can install an extension that will let you see portions of every HTTP request you make and every response you get. The extension is called LiveHTTPHeaders, and it's available from
http://livehttpheaders.mozdev.org/. This can be very useful in debugging web applications, but you can see only the headers, not the actual request or response data.
Several web applications also exist that will make an HTTP request on your behalf and show you the request and response. The most full-featured application of this sort is Web-Sniffer, at LiveHTTPHeaders
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