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fix: allow concurrent streamable http requests #1186

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fix: allow concurrent streamable http requests #1186

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fd439b3
fix: allow concurrent streamable http requests
nickcoai Aug 18, 2026
2dfe15c
fix: keep streamable http recovery responsive
nickcoai Aug 18, 2026
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11 changes: 11 additions & 0 deletions README.md
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Expand Up @@ -1631,6 +1631,17 @@ let transport = StreamableHttpClientTransport::from_uri("http://localhost:8000/m
let client = ClientInfo::default().serve(transport).await?;
```

The client allows up to 16 ordinary http POSTs at once. Configure this with
`StreamableHttpClientTransportConfig::with_uri(url).max_concurrent_requests(n)`;
`1` keeps ordinary POSTs serial, and `0` is treated as `1`. An open sse response
stream does not count against this limit. Cancellation and replies use a
separate queue with one extra POST slot. Each control POST has a five-second
timeout after it starts. Session recovery waits up to five seconds for old
POSTs, then stops any that remain. Those POSTs are not retried because the
server may have processed them. Configure this wait and the separate
initialization timeout with `session_recovery_timeout`. Callers still decide
which tools may run at the same time and which need approval.

#### Server-Sent Events (SSE)

Streamable HTTP responses arrive as either a single `application/json` body or a
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5 changes: 5 additions & 0 deletions crates/rmcp/Cargo.toml
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Expand Up @@ -295,6 +295,11 @@ name = "test_streamable_http_json_response"
required-features = ["server", "client", "transport-streamable-http-server", "reqwest"]
path = "tests/test_streamable_http_json_response.rs"

[[test]]
name = "test_streamable_http_client_concurrency"
required-features = ["client", "transport-streamable-http-client"]
path = "tests/test_streamable_http_client_concurrency.rs"

[[test]]
name = "test_streamable_http_protocol_version"
required-features = ["server", "client", "transport-streamable-http-server", "reqwest"]
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