Just use ports. Like so: https://ellie-app.com/7XMGG66xhLRa1
(I have adapted the logo example from the library)
Later Edit: you can also convert the received SVG into a base64 encoded string and then create an a element with download set to whatever you want the file to be named and put the base64 encoded value as a dataURI inside thehref. Like so: https://ellie-app.com/7XN53BSQBnga1
(you have to click GetSvg for the download link to appear)