mcp-error-handling-mcp-client-initializes-session-via-streamablehttp--50a3fe43

THEN The client should validate the response content type before proceeding. If the content type is not 'application/json' or 'text/event-stream', raise an exception with a descriptive error message instead of silently printing a warning. This allows callers to catch and handle connection failures gracefully.

async def _validate_content_type(response):
    content_type = response.headers.get('content-type', '')
    if 'application/json' not in content_type and 'text/event-stream' not in content_type:
        raise ValueError(f"Unexpected content type: {content_type}")