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curl
Check response times
The following is an example of a command that can be use to see the timing of various points in a HTTP request like the DNS lookup time.
curl -w "dnslookup: %{time_namelookup} | connect: %{time_connect} | appconnect: %{time_appconnect} | pretransfer: %{time_pretransfer} | starttransfer: %{time_starttransfer} | total: %{time_total} | size: %{size_download}\n" https://impiger-cus-portal-api.azurewebsites.net