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curl -s -w \%{size_header} -o /dev/null https://example.com
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curl -s -w \%{size_header} -o /dev/null http://localhost -H "Host: example.com"
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curl -so /dev/null https://example.com/ -w '%{size_download}'
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curl --compressed -so /dev/null https://example.com/ -w '%{size_download}'