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feat: add native-tls as an optional TLS backend #631

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feat: add native-tls as an optional TLS backend #631

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2 changes: 2 additions & 0 deletions crates/rmcp/Cargo.toml
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Expand Up @@ -88,6 +88,8 @@ reqwest = ["__reqwest", "reqwest?/rustls-tls"]

reqwest-tls-no-provider = ["__reqwest", "reqwest?/rustls-tls-no-provider"]

reqwest-native-tls = ["__reqwest", "reqwest?/native-tls"]

server-side-http = [
"uuid",
"dep:rand",
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4 changes: 4 additions & 0 deletions crates/rmcp/README.md
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Expand Up @@ -270,6 +270,10 @@ RMCP uses feature flags to control which components are included:
- `transport-streamable-http-client-reqwest`: a default `reqwest` implementation of the streamable http client
- `auth`: OAuth2 authentication support
- `schemars`: JSON Schema generation (for tool definitions)
- TLS backend options (for HTTP transports):
- `reqwest`: Uses rustls (pure Rust TLS, recommended default)
- `reqwest-native-tls`: Uses platform native TLS (OpenSSL on Linux, Secure Transport on macOS, SChannel on Windows)
- `reqwest-tls-no-provider`: Uses rustls without a default crypto provider (bring your own)


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Copilot AI Jan 30, 2026

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This section lists the TLS backend flags, but it doesn’t clarify (a) that they’re intended to be mutually exclusive and (b) that transport-streamable-http-client-reqwest / auth only enable the reqwest dependency (__reqwest) and still require exactly one of these TLS backend features to support https. Adding a short note about the required feature combinations would prevent misconfiguration and surprising runtime errors.

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These TLS backend features are intended to be mutually exclusive: enable at most one of them at a time. When using
`transport-streamable-http-client-reqwest` or `auth`, those features only enable the `reqwest` dependency (`__reqwest`)
and do not select a TLS backend for you; to support HTTPS, you must also enable exactly one of the TLS backend features
listed above.

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## Transports
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