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The --help output for curl lists a --resolve option, which states

--resolve <host:port:address> Force resolve of HOST:PORT to ADDRESS

I'm not having any luck getting it to work though. The basic command I'm trying to run is

curl --resolve foo.example.com:443:localhost https://foo.example.com:443/

and I keep getting the response Couldn't resolve host 'foo.example.com'. I want do do this because I'm testing a certificate for foo.example.com, but I'm not testing it on the actual server. Instead, I'm testing it on a dummy machine. I know that I can edit /etc/hosts so that foo.example.com resolves to localhost, but this curl approach seems like it would be the "correct" way to go, if I could make it work.

Does anybody see what I'm doing wrong here?

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up vote 4 down vote accepted

It appears that the address needs to be a numeric IP address, not a hostname.

Try this:

curl --resolve foo.example.com:443:127.0.0.1 https://foo.example.com:443/
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And that solves it. Thank you very much! –  tsuraan Mar 1 '12 at 1:15
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