获取GraphicsMagick以从https URL打开文件?

我可以使用GraphicsMagick下载给定URL的图像，但是当URL以https开头时，出现以下错误(对于

I can use GraphicsMagick to download images given a URL, however when the URL starts with a https I get the following error (for https://example.com/image.png):

Unable to open file (//example.com/image.png) [No such file or directory].

我正在为node.js使用 gm 驱动程序，其代码如下:

I am using the gm driver for node.js with code like so:

gm = require('gm');
gm(url).write(name);

，但也直接从命令行尝试了 gm ，出现了同样的问题.

but have also tried the gm directly from the command line with the same issue.

如前所述，它对于http URL可以正常工作，我可以在https上使用它吗?

As stated already, it works fine for http URLS, can I get it to work for https?