How to get response from https url using curl and shell script

Question

I have written a unix script using curl that returns the response headers of the http url.However i would like to do the same for https and i am unable to do so.I need these to check if the sites are up and running or not.

My code for http sites

status=$(curl -s --head  -w %{http_code} http://10.196.56.112:9081/ -o /dev/null)
echo $status

if [ "$status" == "000" ];
then echo "Server down"

else
echo "Server up"
fi

Daniel Stenberg · Accepted Answer · 2015-08-03 11:27:02Z

1

It works exactly the same way for HTTPS.

The only little difference is that HTTPS implies that curl will verify the TLS certificate of the server and unless you use --insecure curl will exit with an error if it can't verify it successfully. In your example here, you use an IP address and not a name and that will most certainly cause a certificate check to fail.

answered Aug 3, 2015 at 11:27

Daniel Stenberg

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7 Comments

Anil N.P Over a year ago

Thanks Daniel.. It did work !!! Cheers. However could you help me in depth regarding why curl will exit with an error?

Daniel Stenberg Over a year ago

If you have another question, file another question!

Anil N.P Over a year ago

I have a dynamic DNS configured at my end so will it skip the certificate check when the final address is resolved?

Daniel Stenberg Over a year ago

curl only skips the check if you use -k / --insecure

Anil N.P Over a year ago

Is there a way to set a time limit that the curl waits for the header response?As i do not want my entire script to wait for a long time just because a single URL is in hung state.

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