Close the stream as early as possible

Author: JordonPhillips

packages/smithy-http/src/smithy_http/aio/crt.py

@@ -362,6 +362,10 @@ def read(self, size: int | None = -1) -> bytes:
             return b""
 
         if len(self._chunks) == 0:
+            if self._done:
+                self.close()
+                return b""
+
             # When the CRT recieves this, it'll try again later.
             raise BlockingIOError("read")