wget.sh

# This use wget to download the file with:
# infinite retries
# keep retrying even when there is no connection
# wait 3s between retries
# continue from last point if failed and there is a file named test.file in the target directory
# with limited bandwidth rate of 2 000 000 Bytes/s
# and put the file to the path/filename

wget -t 0 --retry-connrefused --waitretry=3s -c --limit-rate=2000000 --output-document=~/Downloads/test.file http://localhost/file/test.file

# If you want to stop retrying, say after 100 times, put "-t 100" instead of "-t 0" 
# If it failed after 100th retries, the plan is you could save this command as failed download to a database,
# then possibly run a sweeper for failed downloads that ran every N minutes and retry it with the same command