[Python] I meet the Error Connecting to MCP Inspector Proxy

My MCP server started by command "mcp dev server.py" Then the command line displays： Starting MCP inspector... ⚙️ Proxy server listening on port 6277 MCP Inspector is up and running at http://127.0.0.1:6274

but I can not connect to the server in MCP Inspector page

Omg how can i do ?

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