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feat!: remove SSE transport support (#562)

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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
This commit is contained in:
adam jones 2025-12-02 01:40:13 +00:00 • committed by GitHub
commit eb5a7f7408
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1 changed files with 164 additions and 1688 deletions
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17
crates/rmcp/src/transport.rs
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@ -2,13 +2,12 @@
//! The transport type must implemented [`Transport`] trait, which allow it send message concurrently and receive message sequentially.
//！
//! ## Standard Transport Types
//! There are 3 pairs of standard transport types:
//! There are 2 pairs of standard transport types:
//!
//! | transport | client | server |
//! |:-: |:-: |:-: |
//! | std IO | [`child_process::TokioChildProcess`] | [`io::stdio`] |
//! | streamable http | [`streamable_http_client::StreamableHttpClientTransport`] | [`streamable_http_server::StreamableHttpService`] |
//! | sse | [`sse_client::SseClientTransport`] | [`sse_server::SseServer`] |
//!
//！## Helper Transport Types
//! Thers are several helper transport types that can help you to create transport quickly.
@ -95,20 +94,6 @@ pub mod io;
#[cfg_attr(docsrs, doc(cfg(feature = "transport-io")))]
pub use io::stdio;
#[cfg(feature = "transport-sse-client")]
#[cfg_attr(docsrs, doc(cfg(feature = "transport-sse-client")))]
pub mod sse_client;
#[cfg(feature = "transport-sse-client")]
#[cfg_attr(docsrs, doc(cfg(feature = "transport-sse-client")))]
pub use sse_client::SseClientTransport;
#[cfg(feature = "transport-sse-server")]
#[cfg_attr(docsrs, doc(cfg(feature = "transport-sse-server")))]
pub mod sse_server;
#[cfg(feature = "transport-sse-server")]
#[cfg_attr(docsrs, doc(cfg(feature = "transport-sse-server")))]
pub use sse_server::SseServer;
#[cfg(feature = "auth")]
#[cfg_attr(docsrs, doc(cfg(feature = "auth")))]
pub mod auth;