missing "Protocol"

Author: jonemo

python-packages/smithy-python/smithy_python/interfaces/http.py

@@ -81,7 +81,7 @@ def get_value_list(self) -> list[str]:
         ...
 
 
-class Fields:
+class Fields(Protocol):
     """
     Protocol agnostic mapping of key-value pair request metadata, such as HTTP fields.
     """