Simplify previous commit.

(Mostly a matter of taste.)

Refs #1617.

Author: aaugustin

Diff for: src/websockets/http11.py

@@ -159,12 +159,10 @@ def parse(
             raise NotImplementedError("transfer codings aren't supported")
 
         if "Content-Length" in headers:
-            content_length = headers["Content-Length"]
-            if content_length != "0":
-                raise ValueError(
-                    f"unsupported request body as 'Content-Length' is "
-                    f"non-zero: {content_length}"
-                )
+            # Some devices send a Content-Length header with a value of 0.
+            # This raises ValueError if Content-Length isn't an integer too.
+            if int(headers["Content-Length"]) != 0:
+                raise ValueError("unsupported request body")
 
         return cls(path, headers)
 

Diff for: tests/test_http11.py

@@ -83,25 +83,12 @@ def test_parse_body(self):
             next(self.parse())
         self.assertEqual(
             str(raised.exception),
-            "unsupported request body as 'Content-Length' is non-zero: 3",
+            "unsupported request body",
         )
 
     def test_parse_body_content_length_zero(self):
-        # Example from the protocol overview in RFC 6455
-        self.reader.feed_data(
-            b"GET /chat HTTP/1.1\r\n"
-            b"Host: server.example.com\r\n"
-            b"Upgrade: websocket\r\n"
-            b"Connection: Upgrade\r\n"
-            b"Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n"
-            b"Origin: http://example.com\r\n"
-            b"Sec-WebSocket-Protocol: chat, superchat\r\n"
-            b"Sec-WebSocket-Version: 13\r\n"
-            b"Content-Length: 0\r\n"
-            b"\r\n"
-        )
+        self.reader.feed_data(b"GET / HTTP/1.1\r\nContent-Length: 0\r\n\r\n")
         request = self.assertGeneratorReturns(self.parse())
-        self.assertEqual(request.path, "/chat")
         self.assertEqual(request.headers["Content-Length"], "0")
 
     def test_parse_body_with_transfer_encoding(self):