fix StreamingResponse message content encoding (#55)

* encode message_str

* 🎨 lint code

* 💚 fix CI

---------

Co-authored-by: Ajinkya Indulkar <26824103+ajndkr@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -21,6 +21,7 @@ on:
 env:
   PYTHON_VERSION: 3.9
   COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
 jobs:
   build-and-test:

lanarky/callbacks/base.py

@@ -33,7 +33,11 @@ class AsyncStreamingResponseCallback(AsyncLanarkyCallback):
 
     def _construct_message(self, message_str: str) -> Message:
         """Construct a Message from a string."""
-        return {"type": "http.response.body", "body": message_str, "more_body": True}
+        return {
+            "type": "http.response.body",
+            "body": message_str.encode("utf-8"),
+            "more_body": True,
+        }
 
 
 class AsyncWebsocketCallback(AsyncLanarkyCallback):
@@ -44,4 +48,4 @@ class AsyncWebsocketCallback(AsyncLanarkyCallback):
 
     def _construct_message(self, message_str: str) -> dict:
         """Construct a WebsocketResponse from a string."""
-        return {**self.response.dict(), **{"message": message_str}}
+        return {**self.response.dict(), **{"message": message_str.encode("utf-8")}}