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lt --port your_app_port --subdomain subdomain_you_want --local-host "127.0.0.1" -o --print-request

keep in mind that some applications run on http://localhost:some_port rather than http://127.0.0.1:some_port. in that case, you'd have to replace above --local-host param with "localhost"

source: https://github.com/localtunnel/localtunnel/issues/259