I either don't understand what you want, or if I do understand, it makes no sense. Use wget or browser to download by URL and how would you generally know what the URL is for a cover anyway?
There at least 6 ways to add a cover:
1) It's in the ebook file already and automatic when you add the ebook
2) You can go to Download in Edit Metadata and the usual book places are searched and you click on result you want.
3) Create a Generic cover from title & author in Edit Metadata
4) Browse to a directory where you have saved covers/images and pick one.
5) A cover creator addin that lets you create or edit a cover
6) Go to image editor of choice on your system via the cover thumnail even if there is no cover.
Where does this url you want to load from come from?
See wget (can be added to Windows and installed by default on Linux).
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