2018-11-05 15:59:17,452 - synapse.http.server - 112 - ERROR - GET-1929865 - Failed handle request via <function _async_render_GET at 0x7feaeeffae60>: <XForwardedForRequest at 0x7fea99f53a28 method=u'GET' uri=u'/_matrix/media/r0/preview_url?url=<redacted>: Traceback (most recent call last):
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 654, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1475, in gotResult
_inlineCallbacks(r, g, status)
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1416, in _inlineCallbacks
result = result.throwExceptionIntoGenerator(g)
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/python/failure.py", line 491, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
--- <exception caught here> ---
File "synapse/http/server.py", line 81, in wrapped_request_handler
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1416, in _inlineCallbacks
result = result.throwExceptionIntoGenerator(g)
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/python/failure.py", line 491, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
File "synapse/rest/media/v1/preview_url_resource.py", line 160, in _async_render_GET
File "/home/matrix/.synapse/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
result = g.send(result)
File "synapse/rest/media/v1/preview_url_resource.py", line 226, in _do_preview
File "synapse/rest/media/v1/preview_url_resource.py", line 473, in decode_and_calc_og
File "src/lxml/parser.pxi", line 1689, in lxml.etree.HTMLParser.__init__
File "src/lxml/parser.pxi", line 823, in lxml.etree._BaseParser.__init__
exceptions.LookupError: unknown encoding: '"utf-8"'
