diff --git a/langchain_mcp_adapters/sessions.py b/langchain_mcp_adapters/sessions.py
index a8af8a5..5d4cce7 100644
--- a/langchain_mcp_adapters/sessions.py
+++ b/langchain_mcp_adapters/sessions.py
@@ -383,7 +383,7 @@ async def create_session(connection: Connection) -> AsyncIterator[ClientSession]
             raise ValueError(msg)
         async with _create_sse_session(**params) as session:
             yield session
-    elif transport == "streamable_http":
+    elif transport in {"streamable_http", "streamable-http", "http"}:
         if "url" not in params:
             msg = "'url' parameter is required for Streamable HTTP connection"
             raise ValueError(msg)