diff --git a/cozeloop/internal/consts/__init__.py b/cozeloop/internal/consts/__init__.py
index 44ea376..2fa0c50 100644
--- a/cozeloop/internal/consts/__init__.py
+++ b/cozeloop/internal/consts/__init__.py
@@ -30,7 +30,7 @@
 
 STATUS_CODE_ERROR_DEFAULT = -1
 
-GLOBAL_TRACE_VERSION = 1
+GLOBAL_TRACE_VERSION = 0
 
 
 # System reserved tag fields.
diff --git a/cozeloop/internal/trace/span.py b/cozeloop/internal/trace/span.py
index 6189a5a..aa17697 100644
--- a/cozeloop/internal/trace/span.py
+++ b/cozeloop/internal/trace/span.py
@@ -559,7 +559,7 @@ def to_header(self) -> Dict[str, str]:
     def to_header_baggage(self) -> str:
         if not self.baggage:
             return ""
-        return ",".join(f"{k}={v}" for k, v in self.baggage().items())
+        return ",".join(f"{k}={v}" for k, v in self.baggage().items() if k and v)
 
     def to_header_parent(self) -> str:
         return f"{GLOBAL_TRACE_VERSION:02x}-{self.trace_id}-{self.span_id}-{self.flags:02x}"
@@ -631,6 +631,9 @@ def parse_comma_separated_map(src: str, cover: bool) -> Dict[str, str]:
         key = urllib.parse.unquote(kv[0])
         value = urllib.parse.unquote(kv[1])
 
+        if not key or not value:
+            continue
+
         if key not in baggage or cover:
             baggage[key] = value