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Troubleshooting a website. You can replace http://website.com with http://localhost if you wish to test the domain on the local machine

curl -Iv -X GET 12.34.56.78 -H 'Host: example.com'

The following command is used to test a https domain. -k will skip the certificate check

curl -Ik -X GET https://website.com

Testing a vhost on the localhost

curl -Iv -x GET localhost -H 'Host: vhost.com'

Testing to see if a website returns a certain string. Body match strings are often used in monitoring alerts

lynx -dump http://lukeslinuxlessons.co.uk | grep 'string match'

curl -i http://website.com | grep body_match_string

If the website has an ssl certificate you can also apply the 'k' option to bypass the certificate check. e.g:

curl -ik https://website.com | grep body_match_string