Optional:    true,
			Type:        "boolean",
		},
		config.HelpKV{
			Key:         browserReferrerPolicy,
			Description: `set Referrer-Policy response header value` + defaultHelpPostfix(browserReferrerPolicy),
			Optional:    true,
			Type:        "string",
		},
	}

the C parts of the package. For example:

	// #include <stdio.h>
	// #include <errno.h>
	import "C"

The preamble may contain any C code, including function and variable
declarations and definitions. These may then be referred to from Go
code as though they were defined in the package "C". All names
declared in the preamble may be used, even if they start with a
lower-case letter. Exception: static variables in the preamble may