diff --git a/pyproject.toml b/pyproject.toml index 32a4de71cd..020bf723ca 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -38,6 +38,7 @@ dependencies = [ "pywin32>=311; sys_platform == 'win32' and python_version >= '3.14'", "pywin32>=310; sys_platform == 'win32' and python_version < '3.14'", "pyjwt[crypto]>=2.10.1", + "cryptography>=49,<50; python_version < '3.11'", "typing-extensions>=4.9.0", "typing-inspection>=0.4.1", ] diff --git a/src/mcp/server/streamable_http.py b/src/mcp/server/streamable_http.py index 2e8236d973..f1118547e3 100644 --- a/src/mcp/server/streamable_http.py +++ b/src/mcp/server/streamable_http.py @@ -13,7 +13,7 @@ import re from abc import ABC, abstractmethod from collections.abc import AsyncGenerator, Awaitable, Callable -from contextlib import asynccontextmanager +from contextlib import asynccontextmanager, suppress from dataclasses import dataclass from functools import partial from http import HTTPStatus @@ -23,7 +23,7 @@ from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream from pydantic import ValidationError from sse_starlette import EventSourceResponse -from starlette.requests import Request +from starlette.requests import ClientDisconnect, Request from starlette.responses import Response from starlette.types import Receive, Scope, Send @@ -688,6 +688,14 @@ async def _handle_post_request(self, scope: Scope, request: Request, receive: Re finally: await sse_stream_reader.aclose() + except ClientDisconnect: + # The client is already gone; send a response for ASGI middleware + # that expects one, while tolerating a closed socket. + logger.warning("Client disconnected during POST request") + response = self._create_json_response(None, 499) # type: ignore[arg-type] + with suppress(Exception): + await response(scope, receive, send) + return except Exception as err: logger.exception("Error handling POST request") response = self._create_error_response( diff --git a/src/mcp/server/streamable_http_manager.py b/src/mcp/server/streamable_http_manager.py index b26636bc8a..a550301bfb 100644 --- a/src/mcp/server/streamable_http_manager.py +++ b/src/mcp/server/streamable_http_manager.py @@ -6,6 +6,7 @@ import logging import math from collections.abc import AsyncIterator +from http import HTTPStatus from typing import Any, Final from uuid import uuid4 @@ -198,6 +199,31 @@ async def handle_request( receive: ASGI receive function send: ASGI send function """ + # Stateless GET/DELETE cannot establish a stream or terminate a session. + # Reject them before the body limit middleware tries to read a body. + if ( + self.stateless + and self._task_group is not None + and scope["type"] == "http" + and scope["method"] in ("GET", "DELETE") + ): + method = scope["method"] + error = JSONRPCError( + jsonrpc="2.0", + id="", + error=ErrorData( + code=INVALID_REQUEST, + message=f"Method Not Allowed: {method} is not supported in stateless mode", + ), + ) + response = Response( + content=error.model_dump_json(by_alias=True, exclude_unset=True), + status_code=HTTPStatus.METHOD_NOT_ALLOWED, + headers={"Allow": "POST"}, + media_type="application/json", + ) + await response(scope, receive, send) + return await self.asgi_app(scope, receive, send) async def _handle_request( diff --git a/tests/server/test_streamable_http_manager.py b/tests/server/test_streamable_http_manager.py index b1cadd677a..af03a7b7ea 100644 --- a/tests/server/test_streamable_http_manager.py +++ b/tests/server/test_streamable_http_manager.py @@ -351,6 +351,73 @@ async def mock_receive(): assert len(transport._request_streams) == 0, "Transport should have no active request streams" +@pytest.mark.anyio +@pytest.mark.parametrize("method", ["GET", "DELETE"]) +async def test_stateless_http_rejects_session_methods(method: str) -> None: + """Stateless HTTP has no standalone SSE stream or session to terminate.""" + manager = StreamableHTTPSessionManager(app=Server("test-stateless-methods"), stateless=True) + sent: list[Message] = [] + + async def receive() -> Message: + raise AssertionError("GET and DELETE must not read a request body") # pragma: no cover + + async def send(message: Message) -> None: + sent.append(message) + + scope: Scope = { + "type": "http", + "method": method, + "path": "/mcp", + "headers": [ + (b"accept", b"application/json, text/event-stream"), + (b"content-length", b"999999999"), + ], + } + async with manager.run(): + with anyio.fail_after(5): + await manager.handle_request(scope, receive, send) + + response = next(message for message in sent if message["type"] == "http.response.start") + assert response["status"] == 405 + assert (b"allow", b"POST") in response["headers"] + body = b"".join(message.get("body", b"") for message in sent if message["type"] == "http.response.body") + error = json.loads(body) + assert error["jsonrpc"] == "2.0" + assert error["id"] == "" + assert error["error"]["code"] == INVALID_REQUEST + assert error["error"]["message"] == f"Method Not Allowed: {method} is not supported in stateless mode" + + +@pytest.mark.anyio +async def test_disconnected_stateless_post_returns_client_closed_request(caplog: pytest.LogCaptureFixture) -> None: + """A client leaving before its POST body arrives is not a server error.""" + manager = StreamableHTTPSessionManager(app=Server("test-disconnected-post"), stateless=True) + sent: list[Message] = [] + + async def receive() -> Message: + return {"type": "http.disconnect"} + + async def send(message: Message) -> None: + sent.append(message) + + scope: Scope = { + "type": "http", + "method": "POST", + "path": "/mcp", + "headers": [ + (b"content-type", b"application/json"), + (b"accept", b"application/json, text/event-stream"), + ], + } + async with manager.run(): + with anyio.fail_after(5): + await manager.handle_request(scope, receive, send) + + response = next(message for message in sent if message["type"] == "http.response.start") + assert response["status"] == 499 + assert not any(record.levelno >= logging.ERROR for record in caplog.records) + + @pytest.mark.anyio async def test_stateless_request_cancels_server_task_when_request_ends() -> None: """A completed stateless request must not leave its server task running.""" @@ -391,37 +458,50 @@ async def send(message: Message) -> None: @pytest.mark.anyio async def test_stateless_stream_closes_cleanly_on_shutdown() -> None: - """Shutdown should send the final body chunk for an active SSE stream.""" - manager = StreamableHTTPSessionManager(app=Server("test-stateless-shutdown"), stateless=True) + """Shutdown should close an active stateless POST response stream.""" + app = Server("test-stateless-shutdown") + tool_started = anyio.Event() + + @app.call_tool() + async def handle_call_tool(name: str, arguments: dict[str, Any]) -> list[TextContent]: + tool_started.set() + await anyio.sleep_forever() + raise AssertionError("unreachable") # pragma: no cover + + manager = StreamableHTTPSessionManager(app=app, stateless=True) stream_started = anyio.Event() stream_closed = anyio.Event() request_received = False + body = json.dumps( + {"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "slow", "arguments": {}}} + ).encode() async def receive() -> Message: nonlocal request_received if not request_received: request_received = True - return {"type": "http.request", "body": b"", "more_body": False} + return {"type": "http.request", "body": body, "more_body": False} await anyio.sleep_forever() raise AssertionError("unreachable") # pragma: no cover async def send(message: Message) -> None: - if message["type"] == "http.response.start": + if message["type"] == "http.response.start" and message["status"] == 200: stream_started.set() if message["type"] == "http.response.body" and not message.get("more_body", False): stream_closed.set() scope: Scope = { "type": "http", - "method": "GET", + "method": "POST", "path": "/mcp", - "headers": [(b"accept", b"text/event-stream")], + "headers": 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