If you look back up at the client log I posted, you'll see that there are 3 different times produced amongst the 5 responses shown:
Client-Date: Sun, 30 Apr 2006 05:50:44 GMT
Client-Date: Sun, 30 Apr 2006 05:50:46 GMT
Client-Date: Sun, 30 Apr 2006 05:50:47 GMT
And if I run more client I get more different times. They are not all unique because 1 second is a long time in computer terms. It just means that the server was able to respond to 2 or more client connects within the same second. For a real server you would want to achieve a much higher rate than 1 per second.
As far as I can tell from your code, all the other data are invarient. You could use Time::HiRes to get finer granularity to convince yourself, or perhaps add another header with a unique value.
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