SSE transport has been removed from the MCP specification in favor of streamable HTTP. This removes all SSE-specific transport code: - Remove `transport-sse-client` and `transport-sse-server` features - Remove `SseClientTransport` and `SseServer` types - Remove SSE-specific examples (`counter_sse`, `counter_sse_directly`) - Migrate auth examples from SSE to streamable HTTP - Update tests to remove SSE transport usage - Update documentation BREAKING CHANGE: The following have been removed: - `transport-sse-client` feature - `transport-sse-client-reqwest` feature - `transport-sse-server` feature - `SseClientTransport` type - `SseServer` type - `sse_client` and `sse_server` modules Users should migrate to streamable HTTP transport which provides equivalent functionality. See `StreamableHttpClientTransport` and `StreamableHttpService` for the replacement APIs. Ref: https://github.com/modelcontextprotocol/rust-sdk/pull/561#issuecomment-3576551699 |
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