Add equivalent cURL --resolve flag

Per cURL --help:

–resolve HOST:PORT:ADDRESS Force resolve of HOST:PORT to ADDRESS

(bypasses hosts file)

example usage:

http --resolve "www.foo.com:127.0.0.1" GET www.foo.com/whatever

OR

http --resolve "www.foo.com:8080:127.0.0.1" GET www.foo.com:8080/whatever

[CMCDragonkai]

The above trick doesn’t work for HTTPS sites. We need a full resolve option similar to curl.

[tn-osimis]

In case anybody is confused as to why this is needed “for HTTPS”, it’s specifically when TLS SNI (Server Name Indication) is used in place of the HTTP Host header to disambiguate connections (e.g. hostname-based L7 routing in reverse-proxies, or “virtual server” use-cases in general), which is extremely common.

In that context, resolving the IP beforehand isn’t sufficient as it won’t constitute a virtual server name expected by the actual server.

If an equivalent to --resolve isn’t desirable for any reason, forcing the SNI value (e.g. --sni) would be an acceptable alternative IMO since we can already do the equivalent for plain HTTP (i.e. set the Host header value explicitly).