Fix #2752: Get rid of IndexError in aiohttp web server

aio-libs · Feb 26, 2018 · 19f4f89 · 19f4f89
1 parent 6c92e8f
commit 19f4f89
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diff --git a/CHANGES/2752.bugfix b/CHANGES/2752.bugfix
@@ -0,0 +1 @@
+Fix ``IndexError`` in HTTP request handling by server.
diff --git a/aiohttp/web_protocol.py b/aiohttp/web_protocol.py
@@ -244,12 +244,14 @@ def data_received(self, data):
                         500, exc))
                 self.close()
             else:
-                for (msg, payload) in messages:
-                    self._request_count += 1
-                    self._messages.append((msg, payload))
-
-                if self._waiter:
-                    self._waiter.set_result(None)
+                if messages:
+                    # sometimes the parser returns no messages
+                    for (msg, payload) in messages:
+                        self._request_count += 1
+                        self._messages.append((msg, payload))
+
+                    if self._waiter is not None:
+                        self._waiter.set_result(None)
 
                 self._upgraded = upgraded
                 if upgraded and tail: