sidebar_position: 3
:::danger IMPORTANT
If your MCP server is running in host mode, include your acquired API key in your client’s headers as shown below:
async with sse_client("http://localhost:9382/sse", headers={"api_key": "YOUR_KEY_HERE"}) as streams:
    # Rest of your code...
Or follow the requirements of OAuth 2.1 Section 5 by providing an Authorization request headers field:
async with sse_client("http://localhost:9382/sse", headers={"Authorization": "YOUR_KEY_HERE"}) as streams:
    # Rest of your code...
:::