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Asked: 2026-06-10T21:18:00+00:00

I am creating a downloadaccelerator library Is there any way to know before starting

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I am creating a downloadaccelerator library
Is there any way to know before starting a download from a link weather the server supports resuming downloads/downloading file reange . Because if it does then i ll use multipple connections and download ranges or else i ll download the whole file normally

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  1. Editorial Team

    Similar to GET header to get the required html page, we have something called as HEAD header.

    When you send a HEAD request for an URL we get a set of values for the URL

    Example: if you want to know details of
    http://www.wgz.org/chromatic/perl/IntroTestMore.pdf

    Send a HEAD command to the URL, the response will be

    Date: Mon, 03 Nov 2008 06:29:09 GMT
Accept-Ranges: bytes
ETag: "156046f-11889-3a578cd2bf2c0"
Server: Apache
Content-Length: 71817
Content-Type: application/pdf
Last-Modified: Thu, 11 Jul 2002 04:53:07 GMT
Client-Date: Mon, 03 Nov 2008 06:29:10 GMT
Client-Peer: 167.168.132.148:8080
Client-Response-Num: 1

    Intresting Values: Accept-Ranges, Content-Length

    Accept-Ranges: bytes tells that server is ready to give files part by part as requested

    More info here: http://www.crazyengineers.com/community/threads/how-does-resume-download-work.7396/

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