b.WriteString(c.Name)
	b.WriteRune('=')
	b.WriteString(sanitizeCookieValue(c.Value, c.Quoted))

	if len(c.Path) > 0 {
		b.WriteString("; Path=")
		b.WriteString(sanitizeCookiePath(c.Path))
	}
	if len(c.Domain) > 0 {
		if validCookieDomain(c.Domain) {
			// A c.Domain containing illegal characters is not
			// sanitized but simply dropped which turns the cookie

		{"/path", "/path"},
		{"/path with space/", "/path with space/"},
		{"/just;no;semicolon\x00orstuff/", "/justnosemicolonorstuff/"},
	}
	for _, tt := range tests {
		if got := sanitizeCookiePath(tt.in); got != tt.want {
			t.Errorf("sanitizeCookiePath(%q) = %q; want %q", tt.in, got, tt.want)
		}
	}

	if got, sub := logbuf.String(), "dropping invalid bytes"; !strings.Contains(got, sub) {