function fixedEncodeURI(str) {
    const prepURL = new URL(str);
    const origin = prepURL.origin;
    let raw = str;
    let decoded = decodeURI(str);
    while (raw !== decoded) {
        decoded = decodeURI(decoded);
        raw = decodeURI(raw);
    }
    justPath = decoded.replace(origin, '');
    let output = origin + encodeURIComponent(justPath).replace(/[!'()*]/g, function(c) {
        return '%' + c.charCodeAt(0).toString(16);
    });
    return output.replace(/%3F/g, '?').replace(/%3D/g, '=').replace(/%26/g, '&');
}

// fixedEncodeURI('http://foo.bar/foo/bar/ツ') returns http://foo.bar%2Ffoo%2Fbar%2F%E3%83%84