fix/refac: stt default content type

backend/open_webui/utils/misc.py

@@ -622,6 +622,10 @@ def strict_match_mime_type(supported: list[str] | str, header: str) -> Optional[
 
         supported = [s for s in supported if s.strip() and "/" in s]
 
+        if len(supported) == 0:
+            # Default to common types if none are specified
+            supported = ["audio/*", "video/webm"]
+
         match = mimeparse.best_match(supported, header)
         if not match:
             return None