fix tavily. (#389)

Author: xiangkaiz

mcp_servers/tavily/server.py

@@ -36,6 +36,7 @@
 def extract_api_key(request_or_scope) -> str:
     """Extract API key from headers or environment."""
     api_key = os.getenv("API_KEY")
+    auth_data = None
 
     if not api_key:
         # Handle different input types (request object for SSE, scope dict for StreamableHTTP)
@@ -50,8 +51,6 @@ def extract_api_key(request_or_scope) -> str:
             header_value = headers.get(b'x-auth-data')
             if header_value:
                 auth_data = base64.b64decode(header_value).decode('utf-8')
-        else:
-            auth_data = None
 
         if auth_data:
             try: