cookie.go
func (c *Cookie) SetDomainBytes(domain []byte) {
	c.domain = append(c.domain[:0], domain...)
}
func (c *Cookie) SetDomainBytes(domain []byte) {
	c.domain = append(c.domain[:0], domain...)
}
func ( c * Cookie ) SetDomainBytes ( domain [ ] byte ) { c . domain = append ( c . domain [ : 0 ] , domain ... ) }
// SetDomainBytes sets cookie domain.
SetDomainBytes sets cookie domain .