how to set cron job to run an url every 5 second

i need to run an url every 5 second . i was reading many article about it but i didnt find my answer .
as i read i have to make a sell script that inside shell script write the some command and in crob job with sleep 5 called that shell script .
but i dont know how to make that shell script and what to have to write inside it.
i need advise to write that shell script and after call it in crontab
below in crontab i worte
* * * * * curl http://mysite/key


Source: shell

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