### Please describe the problem.

addurl fails with the following message:

    % git annex addurl --file=episodes/rtq-proteomics1.mp3 https://test.bioinformatics.chat/episodes/rtq-proteomics.mp3                                                                           
    addurl https://test.bioinformatics.chat/episodes/rtq-proteomics.mp3 

      download failed: Requested Range Not Satisfiable


      download failed: Requested Range Not Satisfiable
    failed
    git-annex: addurl: 1 failed


I configured the server to log the Range header as the last field, and this is what I observe:

    x.x.x.x - - [18/Nov/2020:13:32:19 +0000] "GET /episodes/rtq-proteomics.mp3 HTTP/1.1" 416 197 "-" "-" "bytes=30343208-"

So the start of the range is exactly the file size, and the 416 response is warranted. It looks like git annex does not handle this edge case.

### What steps will reproduce the problem?

I'm not sure tbh — I think this happened because I interrupted a previous download of this file.

### What version of git-annex are you using? On what operating system?

Stock git-annex on Fedora 32:

    git-annex version: 8.20200330
    build flags: Assistant Webapp Pairing S3 WebDAV Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite
    dependency versions: aws-0.21.1 bloomfilter-2.0.1.0 cryptonite-0.25 DAV-1.3.4 feed-1.1.0.0 ghc-8.6.5 http-client-0.6.4 persistent-sqlite-2.9.3 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.0.1
    key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL
    remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs hook external
    operating system: linux x86_64
    supported repository versions: 8
    upgrade supported from repository versions: 0 1 2 3 4 5 6 7
    local repository version: 8


### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Yes! git-annex has been working great for me so far, and is powering the bioinformatics chat podcast (https://bioinformatics.chat/). Thanks!

> [[fixed|done]] --[[Joey]]
