[pull] master from Rapptz:master

discord/abc.py

@@ -26,6 +26,7 @@
 
 import copy
 import time
+import secrets
 import asyncio
 from datetime import datetime
 from typing import (
@@ -1614,6 +1615,9 @@ async def send(
         else:
             flags = MISSING
 
+        if nonce is None:
+            nonce = secrets.randbits(64)
+
         with handle_message_parameters(
             content=content,
             tts=tts,

discord/gateway.py

@@ -606,7 +606,10 @@ def latency(self) -> float:
 
     def _can_handle_close(self) -> bool:
         code = self._close_code or self.socket.close_code
-        return code not in (1000, 4004, 4010, 4011, 4012, 4013, 4014)
+        # If the socket is closed remotely with 1000 and it's not our own explicit close
+        # then it's an improper close that should be handled and reconnected
+        is_improper_close = self._close_code is None and self.socket.close_code == 1000
+        return is_improper_close or code not in (1000, 4004, 4010, 4011, 4012, 4013, 4014)
 
     async def poll_event(self) -> None:
         """Polls for a DISPATCH event and handles the general gateway loop.

discord/http.py

@@ -197,6 +197,7 @@ def handle_message_parameters(
 
     if nonce is not None:
         payload['nonce'] = str(nonce)
+        payload['enforce_nonce'] = True
 
     if message_reference is not MISSING:
         payload['message_reference'] = message_reference