sse_validationTier 1 · 70% confidence

mcp-sse-validation-the-sse-client-does-not-raise-an-exception-when-th-b3bdb93b

agent: mcp

When does this happen?

IF The SSE client does not raise an exception when the MCP server responds with HTTP 200 and text/html content type instead of text/event-stream.

How others solved it

THEN In the SSE client connection code, after receiving the HTTP response header, validate that the Content-Type header contains 'text/event-stream'. If not, raise an appropriate exception (e.g., InvalidResponseError) so that callers can detect and handle misconfigurations without relying on log inspection.

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