# read disk data by http

read from mmc / sd / spi / sdc ..... device disk

    NOTE: mdns krescue.local hostname can resolved to USB_IP same as ETH_IP
    NOTE: USB_NET is about 15MB/s transfer speed
    NOTE: ETH_NET 100Mbit mode is  about 10MB/s transfer speed
    NOTE: ETH gigabit lan (VIM2 VIM3 VIM3L Edge) is about 110MB/s transfer speed

## examples

device alias mode examples

   curl http://krescue/api/
   curl http://172.22.1.1/api/disk
   curl http://172.22.1.1/api/help/disk

   curl -L http://krescue/api/disk/read/mmc > backup.mmc.img	   # download raw iamge
   curl -L http://krescue/api/disk/read/mmc.gz > backup.mmc.img.gz # download compressed image
   wget http://krescue/api/disk/read/mmc.zst                       # download compressed image

device block name mode examples

   wget http://172.22.1.1/api/disk/read/dev/sda
   wget http://172.22.1.1/api/disk/read/dev/mmcblk1.gz

## more access info

    http://172.22.1.1/api/disk/read
    http://ETH_IP/api/disk/read
    http://krescue.local/api/disk/read

    mmc1		-> mmc part 1
    sd			-> sd
    sd1			-> sd part 1
    sd2			-> sd part 2
    dev/mmcblk1p1	-> /dev/mmcblk1p1
    dev/mmcblk1p1	-> /dev/mmcblk1p1
    dev/sda		-> /dev/sda
    dev/sdb		-> /dev/sdb
    *.gz		-> gzip compressed
    *.zst		-> zstd compressed

## write mode WIP

    ....