### Please describe the problem.

When I use importfeed to get my podcasts after an update, it's starts to fail on some items and the metadata doesn't get generated. The error given is hPut: invalid argument (invalid character).

### What steps will reproduce the problem?

1. importfeed of a previously working podcast feed

I also noticed that this tends to happen more often when using genmetadata but it still happens when that's not used.

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

I'm on Ubuntu 20.04 (just upgraded from 18.04) with git-annex installed from nix.

    git-annex version: 8.20211011
    build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite S3 WebDAV
    dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.29 DAV-1.3.4 feed-1.3.2.0 ghc-8.10.7 http-client-0.6.4.1 persistent-sqlite-2.13.0.3 torrent-10000.1.1 uuid-1.3.15 yesod-1.6.1.2
    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 X*
    remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg 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

I've had the same problem on my Synology NAS:

    git-annex version: 8.20211012-geb95ed486
    build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite S3 WebDAV
    dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.26 DAV-1.3.4 feed-1.3.0.1 ghc-8.8.4 http-client-0.6.4.1 persistent-sqlite-2.10.6.2 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.1.0
    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 X*
    remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg hook external
    operating system: linux x86_64
    supported repository versions: 8
    upgrade supported from repository versions: 0 1 2 3 4 5 6 7


This is a relatively recent issue for me. I (maybe foolishly) updated my laptop and synology versions at the same time. The NAS was on git-annex-standalone-amd64-7.20191115. I was able to rollback nix to find the last working version and it seems it was:

    git-annex version: 8.20210330
    build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite S3 WebDAV
    dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.28 DAV-1.3.4 feed-1.3.2.0 ghc-8.10.4 http-client-0.6.4.1 persistent-sqlite-2.11.1.0 torrent-10000.1.1 uuid-1.3.14 yesod-1.6.1.0
    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 X*
    remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg 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

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log

$ git init -b main test && cd test && git annex init && git config annex.genmetadata true
$ git-annex importfeed --template='new/${feedtitle}/${itempubdate}-${itemtitle}${extension}' --relaxed --fast https://files.manager-tools.com/files/public/feeds/career_tools_podcasts.xml
[...]
addurl https://traffic.libsyn.com/secure/manager-tools/career-tools-2020-12-24.mp3 (to new/Career_Tools/2020-12-24-MT_Goals_Examples_-_HOF_2020.mp3) git-annex: .git/annex/othertmp/a42_240_URL-s18703819--https&c%%traffic.libsyn.com%secu-da948bd01d45574da2155e03220b1a96.log.met: hPut: invalid argument (invalid character)

$ echo $?
1


# End of transcript or log.
"""]]

### 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)

I've been using git annex for a few years now primarily as a podcatcher. I've also been using it to manage my ebooks and devices. I'm slowly starting to use it for managing my personal (non-text) records and documents.

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