Dan, Yes, I suppose adding milliseconds to the request header using mod_headers with a custom header name like "Milliseconds" would work (example below). It would have to be a custom header because it appears that milliseconds cannot be appended to any "normal" date time fields since the HTTP 1.1 spec only permits times in seconds (http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3). I wonder how much overhead adding custom headers to every request adds in CPU time + RAM? #Config line for mod_headers RequestHeader set Milliseconds "%t" Thanks, http://www.t1shopper.com/ PS. There's a part of our site that dumps the Client's headers (link below). We'd have to remove the custom header on this part of the web site otherwise people would say, "My browser didn't send that header!" So this solution works only most of the time for us. http://www.t1shopper.com/tools/http-headers.php
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