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add stateless http transport support #213

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add stateless http transport support #213

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12 changes: 11 additions & 1 deletion fastapi_mcp/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -330,6 +330,16 @@ def mount_http(
"""
),
] = "/mcp",
stateless: Annotated[
bool,
Doc(
"""
Whether to force stateless transport. When True, the MCP server will ignore
the mcp-session-id header and treat all requests as stateless.
Defaults to False.
"""
),
] = False,
) -> None:
"""
Mount the MCP server with HTTP transport to **any** FastAPI app or APIRouter.
Expand All @@ -348,7 +358,7 @@ def mount_http(

assert isinstance(router, (FastAPI, APIRouter)), f"Invalid router type: {type(router)}"

http_transport = FastApiHttpSessionManager(mcp_server=self.server)
http_transport = FastApiHttpSessionManager(mcp_server=self.server, stateless=stateless)
dependencies = self._auth_config.dependencies if self._auth_config else None

self._register_mcp_endpoints_http(router, http_transport, mount_path, dependencies)
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7 changes: 4 additions & 3 deletions fastapi_mcp/transport/http.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,11 +20,13 @@ def __init__(
event_store: EventStore | None = None,
json_response: bool = True, # Default to JSON for HTTP transport
security_settings: TransportSecuritySettings | None = None,
stateless: bool = False,
):
self.mcp_server = mcp_server
self.event_store = event_store
self.json_response = json_response
self.security_settings = security_settings
self.stateless = stateless
self._session_manager: StreamableHTTPSessionManager | None = None
self._manager_task: asyncio.Task | None = None
self._manager_started = False
Expand All @@ -47,13 +49,12 @@ async def _ensure_session_manager_started(self) -> None:
logger.debug("Starting StreamableHTTP session manager")

# Create the session manager
# Note: We don't use stateless=True because we want to support sessions
# but sessions are optional as per the MCP spec
# Use stateless flag to determine whether to support sessions
self._session_manager = StreamableHTTPSessionManager(
app=self.mcp_server,
event_store=self.event_store,
json_response=self.json_response,
stateless=False, # Always support sessions, but they're optional
stateless=self.stateless, # Use the stateless flag
security_settings=self.security_settings,
)

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