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+Is there a nice way to add a URL from the Wayback machine?
+I don't want to add HTML documents but rather PDFs etc.
+The problem is that web.archive.org doesn't send a Content-Length header:
+
+    $ curl -I http://web.archive.org/web/20171117120847/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg
+    HTTP/1.1 200 OK
+    Server: Tengine/2.1.0
+    Date: Fri, 17 Nov 2017 12:09:35 GMT
+    Content-Type: audio/ogg
+    Connection: keep-alive
+    X-Archive-Orig-content-length: 29784324
+    X-Archive-Orig-accept-ranges: bytes
+    X-Archive-Orig-server: Apache/2.4.29 (Debian)
+    X-Archive-Orig-last-modified: Wed, 11 Feb 2015 01:31:47 GMT
+    X-Archive-Orig-connection: close
+    X-Archive-Orig-etag: "1c67904-50ec5f783257c"
+    X-Archive-Orig-date: Fri, 17 Nov 2017 12:08:49 GMT
+    Cache-Control: max-age=1800
+    X-Archive-Guessed-Content-Type: audio/ogg
+    Memento-Datetime: Fri, 17 Nov 2017 12:08:47 GMT
+    Link: <https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="original", <http://web.archive.org/web/timemap/link/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="timemap"; type="application/link-format", <http://web.archive.org/web/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="timegate", <http://web.archive.org/web/20140426045733/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="first memento"; datetime="Sat, 26 Apr 2014 04:57:33 GMT", <http://web.archive.org/web/20170822174608/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="prev memento"; datetime="Tue, 22 Aug 2017 17:46:08 GMT", <http://web.archive.org/web/20171117120847/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="memento"; datetime="Fri, 17 Nov 2017 12:08:47 GMT", <http://web.archive.org/web/20171117120847/https://downloads.kitenet.net/videos/git-annex/git-annex_views_demo.ogg>; rel="last memento"; datetime="Fri, 17 Nov 2017 12:08:47 GMT"
+    Content-Security-Policy: default-src 'self' 'unsafe-eval' 'unsafe-inline' data: archive.org web.archive.org analytics.archive.org
+    X-App-Server: wwwb-app39
+    X-ts: ----
+    X-Archive-Playback: 0
+    X-location: All
+    X-Page-Cache: MISS
+
+Therefore, I'd have to pass the `--relaxed` flag when calling `addurl`.
+Is there maybe a way to tell git-annex to download the file before checking its size?
+Or is there a way to use the Wayback machine via the S3 special remote?
+
+Eventually, I'd like to have a script that automatically saves all web content in my repo
+into the Wayback machine and adds the new URLs for redundancy.
+
+This is what I've got so far:
+
+    #! /usr/bin/env python3
+    
+    from subprocess import check_output, Popen, PIPE
+    import json
+    from urllib import request
+    from sys import stdout
+    
+    output = check_output(['git-annex', 'find', '--in', 'web', '--json'])
+    files = [json.loads(line)['file'] for line in output.split(b'\n')[:-1]]
+    p = Popen(['git-annex', 'whereis', '--batch', '--json'], stdin=PIPE, stdout=PIPE)
+    p.stdin.writelines(str.encode(f + '\n') for f in files)
+    out, err = p.communicate()
+    urls = []
+    for line in out.split(b'\n')[:-1]:
+        for loc in json.loads(line)['untrusted']:
+            if loc['uuid'] == '00000000-0000-0000-0000-000000000001':
+                url = loc['urls'][0]
+                import urllib.request
+                print('GET https://web.archive.org/save/' + url)
+                r = request.urlopen('https://web.archive.org/save/' + url)
+                assert(r.getcode() == 200)
+                urls.append(r.geturl())
+                break
+    assert(len(files) == len(urls))
+    p = Popen(['git-annex', 'addurl', '--batch', '--with-files', '--relzed'], stdin=PIPE, stdout=stdout)
+    p.stdin.writelines(str.encode(f + ' ' + u) for f, u in zip(urls, files))
+    p.communicate()