Re: Wget

[Tim Rühsen]

Hi,

I guess nobody even tries to reproduce the issue as nobody uses XP or 
the old wget 1.11.4. For example, I don't even have a Windows license 
and thus no Windows installed.

To get better feedback from other users, I would suggest

- update to the latest wget (hundreds of bugs have been fixed 
meanwhile). Static binaries for 32/64 bit Windows can be found at 
https://eternallybored.org/misc/wget/.

- try to reproduce the problem with a minimal set of command line 
options (else others have to do that, and that will costs other people's 
time)

- provide exact steps to reproduce

Without the above, me and others can only guess what is happening.

E.g. pressing reboot may result in unwanted bytes in a file and an 
inconsistent file system. Download continuation is based on the file 
size, not the contents. Wget has no possibility to see if the existing 
file contents are correct or not - it can only see if bytes are missing 
and download+append the missing bytes. Wget also doesn't see if the file 
on the server has been changed or not.

In short: continuation is not reliable.
If you need a byte-exact download, make sure the provider (server) also 
provides a checksum so that you can verify your downloaded file. Without 
it, better don't use -c.

Also think of possible MITM attacks: try to avoid plain text HTTP - use 
HTTPS instead.

Regards, Tim

On 21.01.22 04:03, Дмитрий Дмитрий wrote:
> I am russian.
> Excuse me for my English.
>
> I used old version wget-1.11.4 several years ago.
> I noticed what sometimes happens download errors.
> Wget incorrect getting continue a partially-downloaded file (option -c).
>
> I had two versions this error.
> In one case several bites were incorrect.
> In other case was change size of file. File got other size (more or less as 
> original size).
> This happened when wget was close reboot of computer (reboots'button).
> Wget could not correct continue download a file.
> Errors didn't happen always.
> Sometimes.
>
> Because of it if I didn't have checksum (md5 for example) I must downloaded 
> files two time.
> And compared its.
>
> About it I wrote here.
> https://lists.gnu.org/archive/html/bug-wget/2021-03/msg00025.html
> I think I was not understanded.
> When You don't understand me - let's ask me.

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