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First end-to-end 2026-07-28 stateless tools/call (experimental entry + ClientSession pin) (#2917)

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Max 2026-06-20 14:55:59 +01:00 • committed by GitHub
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9
src/mcp/server/streamable_http_manager.py
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@ -14,6 +14,7 @@ from starlette.requests import Request
from starlette.responses import Response
from starlette.types import Receive, Scope, Send
from mcp.server._streamable_http_modern import handle_modern_request
from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser, AuthorizationContext, authorization_context
from mcp.server.streamable_http import (
MCP_SESSION_ID_HEADER,
@ -22,6 +23,7 @@ from mcp.server.streamable_http import (
)
from mcp.server.transport_security import TransportSecuritySettings
from mcp.shared._compat import resync_tracer
from mcp.shared.version import MODERN_PROTOCOL_VERSIONS
from mcp.types import INVALID_REQUEST, ErrorData, JSONRPCError
if TYPE_CHECKING:
@ -150,6 +152,13 @@ class StreamableHTTPSessionManager:
if self._task_group is None:
raise RuntimeError("Task group is not initialized. Make sure to use run().")
# TODO: header-only routing for now; body-primary classification
# (per SEP-2575) is a follow-up. 2025 paths below remain unchanged.
pv = next((v.decode("latin-1") for k, v in scope["headers"] if k == b"mcp-protocol-version"), None)
if pv in MODERN_PROTOCOL_VERSIONS:
await handle_modern_request(self.app, self.security_settings, pv, scope, receive, send)
return
# Dispatch to the appropriate handler
if self.stateless:
await self._handle_stateless_request(scope, receive, send)