2020-01-20 21:48:49,133 - synapse.http.server - 105 - ERROR - POST-86 - Failed handle request via 'PublicRoomListRestServlet': <XForwardedForRequest at 0x7f7b64307f40 method='POST' uri='/_matrix/client/r0/publicRooms?server=matrix.org' clientproto='HTTP/1.0' site=8008>
Traceback (most recent call last):
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/http/server.py", line 77, in wrapped_request_handler
    await h(self, request)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/http/server.py", line 326, in _async_render
    callback_return = await callback_return
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/rest/client/v1/room.py", line 402, in on_POST
    data = await handler.get_remote_public_room_list(
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/internet/defer.py", line 1416, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/python/failure.py", line 512, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/handlers/room_list.py", line 386, in get_remote_public_room_list
    res = yield self._get_remote_list_cached(
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/internet/defer.py", line 1416, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/python/failure.py", line 512, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/federation/transport/client.py", line 363, in get_public_rooms
    response = yield self.client.get_json(
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/internet/defer.py", line 1416, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/python/failure.py", line 512, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/http/matrixfederationclient.py", line 770, in get_json
    response = yield self._send_request_with_optional_trailing_slash(
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/internet/defer.py", line 1416, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/python/failure.py", line 512, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/http/matrixfederationclient.py", line 246, in _send_request_with_optional_trailing_slash
    response = yield self._send_request(request, **send_request_args)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
    result = g.send(result)
  File "/home/work/im/synapse/env/lib/python3.8/site-packages/synapse/http/matrixfederationclient.py", line 477, in _send_request
    raise e