[Bug] Serving files doesnt support resume/multi connection

[miaadp]

Describe the bug

When serving a file through --serve , The links can not be resumed or use multi connections although it does support range header(which failed)
If you send a request with Range: bytes=0-999999 header, its download less then 1000000 bytes and curl shown this error : transfer closed with 475712 bytes remaining to read0

You can increase or change the range specified in range header, but the result would be same if range is partial and not full file.

To Reproduce

1- Run a server with --serve command
2- Try to download a file from it
3- stop download after few mB
4- try to resume download
or
2- Send a request with range header and see the result length

Expected behavior

When i send a Range: bytes=0-999999 header with my request, I expect to receive bytes from 0 to 999999 which is 1000000 bytes.

Version

Version: 0.18.3
Commit: 3cac28d
Date: 2024-11-29T08:24:07Z

go1.21.13 linux/amd64

Which OS are you running tdl on?

Linux

Additional context

No response