Safari在获取时将zip文件下载为“未知”（使用polyfill）

Question

我设置了这些标题服务器端（golang片段），它在不同的文件夹中压缩了16个文件，这一切都很好，并且在chrome和ff中很好，但是在safari中不起作用。 Javascript代码在下面

.... 
c.Response().Header().Set("Pragma", "public")
    c.Response().Header().Set("Expires", "0")
    c.Response().Header().Set("Cache-Control", "must-revalidate, post-check=0, pre-check=0")
    c.Response().Header().Set("Cache-Control", "public")
    c.Response().Header().Set("Content-Description", "File Transfer")
    c.Response().Header().Set("Content-type", "application/octet-stream")
    c.Response().Header().Set("Content-Transfer-Encoding", "binary")
    c.Response().Header().Set("Content-Lengthg", "177998")
    // header("Content-Length: ".filesize($filepath.$filename));
    filename := "launchaco.zip"
    // c.Response().Header().Set("Content-Type", "application/file")
    c.Response().Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))

    zw := zip.NewWriter(c.Response())

    header := &zip.FileHeader{
        Name:         "index.html",
        Method:       zip.Store,
        ModifiedTime: uint16(time.Now().UnixNano()),
        ModifiedDate: uint16(time.Now().UnixNano()),
    }
....

的Javascript

fetch(document.location.origin + "/SECRET_ENDPOINT?s=" + encodeURIComponent(JSON.stringify(localStorage.getItem('structured-elm-todo-state'))))
    .then(function(response) {
        return response.blob();
    }).then(function(blob) {
        saveAs(blob, "download.zip");
        setTimeout(function() {
            var popup = document.getElementById("downloaded-popup");
            popup.className = "downloader-popup downloader-popup__active"
        }, 1000);
    });