Now curl supports segmented requests through --range, but all this must be manual.
I can use

curl -D "dump1.txt" -H "Range: bytes=0-2000" https://www.baidu.com/img/bd_logo1.png -o part1
curl -D "dump2.txt" -H "Range: bytes=2001-4000" https://www.baidu.com/img/bd_logo1.png -o part2
curl -D "dump3.txt" -H "Range: bytes=4001-" https://www.baidu.com/img/bd_logo1.png -o part3

Segment request
then,
cat part1 part2 part3 >> logo.png
Merge, so that I can use three tcp connections to download files at the same time, and strive for greater bandwidth,
It would be great if these could all be automatic,

Such as

curl -X 3 https://www.baidu.com/img/bd_logo1.png -o logo.png
It will be very happy