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Fix unknown-method error code and add a protocol version registry (#2836)

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Max 2026-06-11 16:47:22 +01:00 • committed by GitHub
commit 7267818e44
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1 changed files with 430 additions and 23 deletions
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6
src/mcp/server/streamable_http.py
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@ -28,7 +28,7 @@ from mcp.server.transport_security import TransportSecurityMiddleware, Transport
from mcp.shared._context_streams import ContextReceiveStream, ContextSendStream, create_context_streams
from mcp.shared._stream_protocols import ReadStream, WriteStream
from mcp.shared.message import ServerMessageMetadata, SessionMessage
from mcp.shared.version import SUPPORTED_PROTOCOL_VERSIONS
from mcp.shared.version import SUPPORTED_PROTOCOL_VERSIONS, is_version_at_least
from mcp.types import (
DEFAULT_NEGOTIATED_VERSION,
INTERNAL_ERROR,
@ -238,7 +238,7 @@ class StreamableHTTPServerTransport:
the stream is closed early because they didn't receive a priming event.
"""
# Only provide close callbacks when client supports resumability
if self._event_store and protocol_version >= "2025-11-25":
if self._event_store and is_version_at_least(protocol_version, "2025-11-25"):
async def close_stream_callback() -> None:
self.close_sse_stream(request_id)
@ -271,7 +271,7 @@ class StreamableHTTPServerTransport:
if not self._event_store:
return
# Priming events have empty data which older clients cannot handle.
if protocol_version < "2025-11-25":
if not is_version_at_least(protocol_version, "2025-11-25"):
return
priming_event_id = await self._event_store.store_event(
str(request_id), # Convert RequestId to StreamId (str)