Restore original create_mcp_http_client default timeout

Remove the read timeout parameter from the default timeout that was
incorrectly added. The original behavior uses a simple 30-second timeout
for all operations when no custom timeout is provided.

Callers that need longer read timeouts (like session_group for SSE
streams) explicitly pass httpx.Timeout(30.0, read=300.0).

This change restores the original behavior from the main branch.

Author: felixweinberger

src/mcp/shared/_httpx_utils.py

@@ -72,7 +72,7 @@ def create_mcp_http_client(
 
     # Handle timeout
     if timeout is None:
-        kwargs["timeout"] = httpx.Timeout(MCP_DEFAULT_TIMEOUT, read=MCP_DEFAULT_SSE_READ_TIMEOUT)
+        kwargs["timeout"] = httpx.Timeout(MCP_DEFAULT_TIMEOUT)
     else:
         kwargs["timeout"] = timeout