Change HttpParserError process

sanic/server.py

@@ -14,7 +14,7 @@ except ImportError:
 
 from .log import log
 from .request import Request
-from .exceptions import RequestTimeout, PayloadTooLarge
+from .exceptions import RequestTimeout, PayloadTooLarge, InvalidUsage
 
 
 class Signal:
@@ -105,9 +105,9 @@ class HttpProtocol(asyncio.Protocol):
         # Parse request chunk or close connection
         try:
             self.parser.feed_data(data)
-        except HttpParserError as e:
+        except HttpParserError:
-            self.bail_out(
+            exception = InvalidUsage('Bad Request')
-                "Invalid request data, connection closed ({})".format(e))
+            self.write_error(exception)
 
     def on_url(self, url):
         self.url = url

tests/test_bad_request.py

@@ -0,0 +1,20 @@
+import asyncio
+from sanic import Sanic
+
+
+def test_bad_request_response():
+    app = Sanic('test_bad_request_response')
+    lines = []
+    async def _request(sanic, loop):
+        connect = asyncio.open_connection('127.0.0.1', 42101)
+        reader, writer = await connect
+        writer.write(b'not http')
+        while True:
+            line = await reader.readline()
+            if not line:
+                break
+            lines.append(line)
+        app.stop()
+    app.run(host='127.0.0.1', port=42101, debug=False, after_start=_request)
+    assert lines[0] == b'HTTP/1.1 400 Bad Request\r\n'
+    assert lines[-1] == b'Error: Bad Request'