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Follow-ups to #1610: de-draft 2026-07-28 terminology, renumber error codes, ProtocolVersion floor (#1671)

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Stephen Halter 2026-06-25 14:07:52 -07:00 • committed by GitHub
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src/ModelContextProtocol.Core/Client/AutoDetectingClientSessionTransport.cs
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@ -76,9 +76,9 @@ internal sealed partial class AutoDetectingClientSessionTransport : ITransport
}
else if (await StreamableHttpClientSessionTransport.TryReadJsonRpcErrorAsync(response, cancellationToken).ConfigureAwait(false) is { } parsedError)
{
// A JSON-RPC error envelope in the body means the peer IS a Streamable HTTP server
// — it just rejected our specific request (e.g., -32004 UnsupportedProtocolVersion,
// -32003 MissingRequiredClientCapability, -32001 HeaderMismatch, or any other
// A JSON-RPC error envelope in the body means the peer IS a Streamable HTTP server.
// It just rejected our specific request (e.g., -32022 UnsupportedProtocolVersion,
// -32021 MissingRequiredClientCapability, -32020 HeaderMismatch, or any other
// application-level error). Don't fall back to SSE — that would mask the real signal
// and surface a misleading "session id required" error from the SSE GET path.
// Adopt the Streamable HTTP transport and throw the structured exception so the