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Free Download Manager site redirected Linux users to malware for years
(www.bleepingcomputer.com)
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this post was submitted on 12 Sep 2023
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How much faster are we talking?
I’ve honestly never looked at my downloads and though huh you should be quicker, well maybe in 90’s.
FDM does some clever things to boost download speeds. It splits up a download into different chuncks, and somehow downloads them concurrently. It makes a big difference for large files (for example, Linux ISOs).
I guess many servers are capping speeds them. Makes sense since I almost never see downloads actually take advantage of my Gigabit internet speeds.
Im curious as to how it would achieve that?
It can’t split a file before it has the file. And all downloads are split up. They’re called packets.
Not saying it doesn’t do it, just wondering how.
It could make multiple requests to the server, asking each request to resume starting at a certain byte.
Interesting.
I feel I’ll save this rabbit hole for weekend and go and have a look at what they do.
The key thing to know is that a client can do an HTTP
HEADrequest to get just theContent-Lengthof the file, and then performGETrequests with theRangerequest header to fetch a specific chunk of a file.This mechanism was introduced in HTTP 1.1 (byte-serving).
Huh.. that’s super interesting and thanks for sharing.
Right? I've not thought about download speeds since the 2000's.
just grabbed a gig file - it would take about 8 minutes with a standard download in Firefox. Use a manager or axel and it will be 30 seconds. Then again speed isnt everything, its also nice to be able to have auto retry and completion.
I was just going to recommend this too; Use axel, aria2 or even ancient hget.