Function name_value_array_to_js 

pub fn name_value_array_to_js<'js, S: AsRef<str>>(
    ctx: &Ctx<'js>,
    pairs: &[(S, S)],
) -> Result<Value<'js>>

Build a JS Array<{ name, value }> straight from name/value pairs via rquickjs-serde — no serde_json::json! / serde_json::Value middle allocation. Used by request/response/apiResponse headersArray().