[Bug-wget] http server responding with 416 but file was not transferred completely

[Josef Moellers]

Hi,

We have seen (at least) one server who has
Accept-Ranges: bytes
in his header but, upon receiving a request with
Range: bytes=23068672-
responds with
HTTP/1.1 416 Requested Range Not Satisfiable
although the file was not transferred completely!

wget then claims that
The file is already fully retrieved; nothing to do.

E.g.
run
  wget https://downloads.dell.com/FOLDER02721216M/1/SUU_14.12.200.69.ISO
the, after a couple of MB, abort the transfer and then continue the
download:
  wget --continue
https://downloads.dell.com/FOLDER02721216M/1/SUU_14.12.200.69.ISO

Maybe the check in src/http.c:
3821   if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE
3822       || (!opt.timestamping && hs->restval > 0 && statcode ==
HTTP_STATUS_OK
3823           && contrange == 0 && contlen >= 0 && hs->restval >= contlen))

should be changed and any HTTP_STATUS_RANGE_NOT_SATISFIABLE with an
incomplete file should show something like

"download continue failed, file incomplete"

Josef