  { value: "max-age=86400", label: "max-age=86400", hasValue: false },
        { value: "no-cache", label: "no-cache", hasValue: false },
        ...defaultOptions,
    ];
    */
    headerOptions["user-agent"] = [
        { value: "Mozilla/5.0", label: "Mozilla/5.0", hasValue: false },
        ...defaultOptions,
    ];

    function getHeaderOptions(headerName) {
        const lc = (headerName || "").toLowerCase();
        let opts = headerOptions[lc];
        return opts || defaultOptions;
    }

    func