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  • thank you so much! it makes sense: GRUB apparently is not even aware it's using network at all. The UEFI spec says that with HTTP boot, the firmware provides a UEFI device handle that supports the UEFI LoadFile protocol, so GRUB can use it to load files, just like loading files from a disk Commented Jun 9, 2023 at 7:11
  • I saw discussion in groups.google.com/g/linux.debian.bugs.dist/c/CqfwbhAd-Xg shows that grub borrows efi firmware functionalities to do file access. Commented Jun 9, 2023 at 7:13
  • Is there anyway to force grub to use its own http agent to access remote files? Commented Jun 9, 2023 at 7:13
  • I don't know of one; you might ask from the GRUB developers, and perhaps present your issue as a case where such a feature would be helpful. Commented Jun 9, 2023 at 7:17
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    Okay, that might be a distribution-specific patch then, as it does not exist on the upstream Git repository code. Commented Jun 9, 2023 at 8:34