c: Copyright (C) Daniel Stenberg, , et al. SPDX-License-Identifier: curl Long: include Short: i Help: Include protocol response headers in the output See-also: verbose Protocols: HTTP FTP Category: important verbose Example: -i $URL Added: 4.8 Multi: boolean --- Include response headers in the output. HTTP response headers can include things like server name, cookies, date of the document, HTTP version and more... With non-HTTP protocols, the "headers" are other server communication. To view the request headers, consider the --verbose option. Prior to 7.75.0 curl did not print the headers if --fail was used in combination with this option and there was error reported by server.