>
>  1) The data for the race about to start updates every (say) 15
>  seconds, and the data for earlier and later races updates only every
>  (say) 5 minutes. There is  no point for me to be hammering the server
>  with requests every 15 seconds for data for races after the upcoming

Try using an HTTP HEAD instruction instead to check if the data has
changed since last time.
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