Description of problem:
Tried to paste an image from URL that is not ASCII. To be specific, this one: http://姫路城.blog.so-net.ne.jp/_images/blog/_a90/xn--uisz2cnx0g/E5A7ABE8B7AFE59F8E20E6B7B7E99B9120E5B9B3E697A5.jpg

I think the issue is known to the Anki developer.

Version-Release number of selected component:
anki-2.0.33-1.fc23

Additional info:
reporter:       libreport-2.6.4
cmdline:        python /usr/bin/anki
dso_list:       python-libs-2.7.10-8.fc23.x86_64
executable:     /usr/bin/anki
kernel:         4.3.5-300.fc23.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
httplib.py:1028:putheader:UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-8: ordinal not in range(128)

Traceback (most recent call last):
  File "/usr/share/anki/aqt/editor.py", line 998, in keyPressEvent
    self.onPaste()
  File "/usr/share/anki/aqt/editor.py", line 1017, in onPaste
    mime = self.mungeClip()
  File "/usr/share/anki/aqt/editor.py", line 1073, in mungeClip
    mime = self._processMime(mime)
  File "/usr/share/anki/aqt/editor.py", line 1102, in _processMime
    return self._processHtml(mime)
  File "/usr/share/anki/aqt/editor.py", line 1163, in _processHtml
    newHtml += self.editor.urlToLink(url)
  File "/usr/share/anki/aqt/editor.py", line 799, in urlToLink
    fname = self.urlToFile(url)
  File "/usr/share/anki/aqt/editor.py", line 817, in urlToFile
    return self._retrieveURL(url)
  File "/usr/share/anki/aqt/editor.py", line 842, in _retrieveURL
    filecontents = urllib2.urlopen(req).read()
  File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python2.7/urllib2.py", line 431, in open
    response = self._open(req, data)
  File "/usr/lib64/python2.7/urllib2.py", line 449, in _open
    '_open', req)
  File "/usr/lib64/python2.7/urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 1229, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib64/python2.7/urllib2.py", line 1196, in do_open
    h.request(req.get_method(), req.get_selector(), req.data, headers)
  File "/usr/lib64/python2.7/httplib.py", line 1053, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib64/python2.7/httplib.py", line 1092, in _send_request
    self.putheader(hdr, value)
  File "/usr/lib64/python2.7/httplib.py", line 1028, in putheader
    values = [str(v) for v in values]
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-8: ordinal not in range(128)

Local variables in innermost frame:
header: 'Host'
self: <httplib.HTTPConnection instance at 0x7f3fafe2de60>
values: (u'\xe5\xa7\xab\xe8\xb7\xaf\xe5\x9f\x8e.blog.so-net.ne.jp',)
v: u'\xe5\xa7\xab\xe8\xb7\xaf\xe5\x9f\x8e.blog.so-net.ne.jp'