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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
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18
examples/clients/README.md
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@ -4,15 +4,6 @@ This directory contains Model Context Protocol (MCP) client examples implemented
## Example List
### SSE Client (`sse.rs`)
A client that communicates with an MCP server using Server-Sent Events (SSE) transport.
- Connects to an MCP server running at `http://localhost:8000/sse`
- Retrieves server information and list of available tools
- Calls a tool named "increment"
### Git Standard I/O Client (`git_stdio.rs`)
A client that communicates with a Git-related MCP server using standard input/output.
@ -68,14 +59,14 @@ A client demonstrating how to use the sampling tool.
- Retrieves server information and list of available tools
- Calls the `ask_llm` tool
### Progress Test Client (`progress_test_client.rs`)
### Progress Test Client (`progress_client.rs`)
A client that communicates with an MCP server using progress notifications.
- Launches the `cargo run --example clients_progress_client -- --transport {stdio|sse|http|all}` to test the progress notifications
- Launches the `cargo run --example clients_progress_client -- --transport {stdio|http|all}` to test the progress notifications
- Connects to the server using different transport methods
- Tests the progress notifications
- The sse and http should run the server first
- The http transport should run the server first
## How to Run
@ -83,9 +74,6 @@ A client that communicates with an MCP server using progress notifications.
Each example can be run using Cargo:
```bash
# Run the SSE client example
cargo run --example clients_sse
# Run the Git standard I/O client example
cargo run --example clients_git_stdio