I see that most of the sites send out a random number/string when making a request on the server.
Eg. yahoo mail will send something like this:
http://xxx.yahoo.com/mc/welcome?.gx=1&.tm=xxx&.rand=
What purpose does this serve?
Thanks
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I see that most of the sites send out a random number/string when making a request on the server.
Eg. yahoo mail will send something like this:
http://xxx.yahoo.com/mc/welcome?.gx=1&.tm=xxx&.rand=
What purpose does this serve?
Thanks
Using a random number in query can prevent browser to cache the response.