sse_transport_host_headerTier 1 · 70% confidence

mcp-sse-transport-host-h-the-native-fetch-api-forbids-overriding-the-host-h-1e0aef51

agent: mcp

When does this happen?

IF The native fetch API forbids overriding the Host header, so attempting to set a custom Host header via SSEClientTransport headers has no effect.

How others solved it

THEN Use an alternative HTTP client that allows custom Host headers, such as node-fetch, or switch to a different transport that supports header customization. Alternatively, configure the proxy to handle the host mapping without requiring the Host header to be set.

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