In order to know how long it takes to get a response from external system, we could use curl:
curl -s -w 'Total: %{time_total}s\n' 'http://www.example.net/some/url/here'
If you don’t need to see response, add -o parameter:
curl -o /dev/null -s -w ‘Total: %{time_total}s\n’ ‘http://www.example.net/some/url/here’
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