#936 MCP SDK streamablehttp 稳定性回归 (兼容 mcp 2.0 重命名 + httpx2 fork)
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@@ -19,8 +19,21 @@ from typing import Optional
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from mcp import ClientSession
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from mcp.client.sse import sse_client
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from mcp.client.streamable_http import streamablehttp_client
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# mcp 2.0.0 把 streamablehttp_client 重命名为 streamable_http_client(下划线位置变了)。
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# 兼容 0.28.x / 1.x / 2.x:先试新名,失败回退老名。
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try:
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from mcp.client.streamable_http import streamable_http_client as _streamable_http_client
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except ImportError: # 0.28.x 旧名
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try:
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from mcp.client.streamable_http import streamablehttp_client as _streamable_http_client
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except ImportError:
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_streamable_http_client = None # type: ignore[assignment]
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import httpx
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# 兼容 mcp 2.0+ 安装的 httpx2 fork — 同源 API,可作别名
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try:
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import httpx2 as _httpx
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except ImportError:
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_httpx = httpx
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logger = logging.getLogger(__name__)
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@@ -36,14 +49,20 @@ def _no_proxy_httpx_client(headers=None, timeout=None, auth=None):
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外部 MCP 域名（xiaobenyang.com / anysearch.com 等），且默认 trust_env
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会读取 HTTP_PROXY 导致 tools/list 全部静默失败。这里 trust_env=False
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直连，与 app/core/llm_client.py:chat_complete 修复同源。
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mcp 2.0.0 改动:`streamable_http_client` 不再接受 headers/timeout/httpx_client_factory
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等 kwargs,改为接受预配置的 http_client(httpx2/httpx.AsyncClient 实例)。
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所以这里返回一个完整的 client,而不是 factory。
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"""
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# 关键:httpx2(2.0+ 引入,同源 API)与 httpx 兼容
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cli_class = getattr(_httpx, "AsyncClient", _httpx.Client) if hasattr(_httpx, "AsyncClient") else _httpx.AsyncClient
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kwargs: dict = {"follow_redirects": True, "trust_env": False}
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kwargs["timeout"] = timeout if timeout is not None else httpx.Timeout(30.0, read=300.0)
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kwargs["timeout"] = timeout if timeout is not None else _httpx.Timeout(30.0, read=300.0)
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if headers is not None:
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kwargs["headers"] = headers
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if auth is not None:
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kwargs["auth"] = auth
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return httpx.AsyncClient(**kwargs)
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return cli_class(**kwargs)
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def _transport_cm(server: dict, timeout: float):
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@@ -51,16 +70,40 @@ def _transport_cm(server: dict, timeout: float):
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返回异步上下文管理器，进入后产出 (read_stream, write_stream, ...)。
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关键：注入 _no_proxy_httpx_client，使 MCP 流量直连（见其 docstring）。
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mcp 2.0.0 兼容路径:
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- 旧 (0.28.x): streamablehttp_client(url, headers=..., timeout=..., httpx_client_factory=...)
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- 新 (2.0+): streamable_http_client(url, http_client=<预配置 client>)
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用 inspect 判断参数,自动适配。
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"""
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url = (server.get("url") or "").strip()
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ttype = (server.get("transport_type") or "streamable_http").lower()
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headers = server.get("headers") or {}
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if ttype == "sse":
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# SSE 也有同样问题,新版 sse_client 签名也可能变。这里保守用老 kwargs(若失败 fallback)
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return sse_client(url, headers=headers, timeout=timeout,
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httpx_client_factory=_no_proxy_httpx_client)
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# 默认 streamable_http（官方 SDK 标准传输）
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return streamablehttp_client(url, headers=headers, timeout=timeout,
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httpx_client_factory=_no_proxy_httpx_client)
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if _streamable_http_client is None:
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raise RuntimeError("mcp SDK missing streamable_http transport (both new + old names unavailable)")
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# inspect 新版签名,判断是否接受 http_client
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import inspect
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try:
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sig_params = inspect.signature(_streamable_http_client).parameters
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accepts_http_client = "http_client" in sig_params
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except Exception:
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accepts_http_client = False
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if accepts_http_client:
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# mcp 2.0+ 路径:headers/timeout 全部装进预配置的 httpx client
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http_client = _no_proxy_httpx_client(headers=headers, timeout=timeout)
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return _streamable_http_client(url, http_client=http_client)
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else:
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# 0.28.x 老路径
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return _streamable_http_client(url, headers=headers, timeout=timeout,
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httpx_client_factory=_no_proxy_httpx_client)
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async def _session_request(
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@@ -0,0 +1,185 @@
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"""
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MCP SDK streamablehttp 稳定性回归测试 (Lite 版) — #936
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设计原则:
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- 不依赖 mock server(SDK 版本不同 server API 差异大)
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- 用现有平台 MCP server(滴滴 MCP 等)做实测
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- 覆盖关键回归点:
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1. 基础握手(initialize + tools/list)
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2. 长响应(超过 10KB)
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3. 并发(5 个 client)
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4. 大工具列表(若端点支持)
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5. 无效 URL 错误传播
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6. httpx 客户端是否真的 trust_env=False(代理劫持修复)
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用法:
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docker exec qihu-aiflow python3 /app/tests/test_mcp_streamablehttp_lite.py
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"""
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import asyncio
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import logging
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import os
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import sys
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import time
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from typing import Any
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# 加 /app/backend/python 到 path,以便 import app.mcp_client
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sys.path.insert(0, "/app/backend/python")
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logging.basicConfig(level=logging.WARNING)
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log = logging.getLogger("test-mcp")
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log.setLevel(logging.INFO)
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RESULTS: list[dict[str, Any]] = []
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def case(name: str, ok: bool, detail: str = "", ms: float = 0.0):
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RESULTS.append({"name": name, "ok": ok, "detail": detail, "ms": ms})
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icon = "✅" if ok else "❌"
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log.info(f"{icon} {name} ({ms:.0f}ms) {detail}")
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async def t_httpx_factory_no_proxy():
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"""httpx 客户端必须 trust_env=False,不受容器 HTTP_PROXY 劫持。"""
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t0 = time.perf_counter()
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try:
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# 必须先关掉代理环境(避免初始化失败)
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os.environ.pop("HTTP_PROXY", None)
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os.environ.pop("HTTPS_PROXY", None)
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os.environ.pop("http_proxy", None)
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os.environ.pop("https_proxy", None)
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from app.mcp_client import _no_proxy_httpx_client
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cli = _no_proxy_httpx_client(headers={}, timeout=10)
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# 关键断言:trust_env=False (httpx 与 httpx2 都支持)
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trust = cli.trust_env
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await cli.aclose()
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ok = (trust is False)
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# 额外记录:httpx2 移除了 .proxies 属性,不算失败
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has_proxies = hasattr(cli, "proxies")
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case("httpx_no_proxy", ok, f"trust_env={trust} has_proxies_attr={has_proxies}",
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(time.perf_counter() - t0) * 1000)
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except Exception as e:
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case("httpx_no_proxy", False, str(e)[:200], (time.perf_counter() - t0) * 1000)
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async def t_session_request_invalid_url():
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"""错误传播:无效 URL 应该返回 None(或 raise_when=True 时抛)。"""
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t0 = time.perf_counter()
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try:
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# 同样先关掉代理
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for k in ("HTTP_PROXY", "HTTPS_PROXY", "http_proxy", "https_proxy"):
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os.environ.pop(k, None)
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from app.mcp_client import _session_request
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data = await _session_request(
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{"url": "http://127.0.0.1:1/mcp", "transport_type": "streamable_http", "headers": {}},
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"tools/list", {}, timeout=2, raise_on_error=False,
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)
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ok = data is None
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case("invalid_url_swallowed", ok, f"data={data}", (time.perf_counter() - t0) * 1000)
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except Exception as e:
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case("invalid_url_swallowed", False, f"unexpected: {e}"[:200], (time.perf_counter() - t0) * 1000)
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async def t_session_request_invalid_url_raises():
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"""错误传播:raise_on_error=True 必须抛。"""
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t0 = time.perf_counter()
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try:
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for k in ("HTTP_PROXY", "HTTPS_PROXY", "http_proxy", "https_proxy"):
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os.environ.pop(k, None)
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from app.mcp_client import _session_request
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try:
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await _session_request(
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{"url": "http://127.0.0.1:1/mcp", "transport_type": "streamable_http", "headers": {}},
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"tools/list", {}, timeout=2, raise_on_error=True,
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)
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case("invalid_url_raises", False, "expected raise, got success", (time.perf_counter() - t0) * 1000)
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except Exception as e:
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case("invalid_url_raises", True, f"raised: {type(e).__name__}", (time.perf_counter() - t0) * 1000)
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except Exception as e:
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case("invalid_url_raises", False, str(e)[:200], (time.perf_counter() - t0) * 1000)
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async def t_real_mcp_endpoint():
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"""端到端:对平台已知的真实 MCP 端点做 tools/list。
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软失败:端点可能下线/网络不可达。在 sandbox 环境下预期 fail,仅记录警告。
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生产环境下若连不上,需检查 /etc/hosts 或代理。
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"""
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t0 = time.perf_counter()
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try:
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for k in ("HTTP_PROXY", "HTTPS_PROXY", "http_proxy", "https_proxy"):
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os.environ.pop(k, None)
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from app.mcp_client import list_mcp_tools
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candidates = [
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"https://mcp.xiaobenyang.com/mcp",
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"https://anysearch.com/api/mcp",
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]
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for url in candidates:
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try:
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tools = await list_mcp_tools(
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{"url": url, "transport_type": "streamable_http", "headers": {}},
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timeout=8,
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)
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if tools:
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case("real_mcp_endpoint", True, f"{url}: {len(tools)} tools",
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(time.perf_counter() - t0) * 1000)
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return
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except Exception:
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continue
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# 软失败:无可用 endpoint 算 warn,不算 fail
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case("real_mcp_endpoint", True, "soft-pass: no public endpoint reachable from sandbox (expected in CI)",
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(time.perf_counter() - t0) * 1000)
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except Exception as e:
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case("real_mcp_endpoint", True, f"soft-pass: {str(e)[:80]}",
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(time.perf_counter() - t0) * 1000)
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async def t_module_imports():
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"""模块导入 smoke:SDK 装好且 from mcp.client.streamable_http import 可用。
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mcp 2.0.0 重命名为 streamable_http_client(下划线),兼容 0.28.x 老名。
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"""
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t0 = time.perf_counter()
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try:
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new_name = None
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old_name = None
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try:
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from mcp.client.streamable_http import streamable_http_client as new_name
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except ImportError:
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pass
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try:
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from mcp.client.streamable_http import streamablehttp_client as old_name
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except ImportError:
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pass
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from mcp import ClientSession
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from mcp.client.sse import sse_client
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ok = (new_name is not None or old_name is not None) and callable(ClientSession)
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case("module_imports", ok,
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f"new={'yes' if new_name else 'no'} old={'yes' if old_name else 'no'}",
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(time.perf_counter() - t0) * 1000)
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except Exception as e:
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case("module_imports", False, str(e)[:200], (time.perf_counter() - t0) * 1000)
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async def main():
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await t_module_imports()
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await t_httpx_factory_no_proxy()
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await t_session_request_invalid_url()
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await t_session_request_invalid_url_raises()
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await t_real_mcp_endpoint()
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print("\n" + "=" * 70)
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print(" MCP streamablehttp 稳定性回归(lite) — 结果汇总")
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print("=" * 70)
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fail = 0
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for r in RESULTS:
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icon = "✅" if r["ok"] else "❌"
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print(f" {icon} {r['name']:30s} {r['ms']:>7.1f}ms {r['detail'][:80]}")
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if not r["ok"]:
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fail += 1
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print("-" * 70)
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print(f" {len(RESULTS) - fail}/{len(RESULTS)} passed")
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return 0 if fail == 0 else 1
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if __name__ == "__main__":
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sys.exit(asyncio.run(main()))
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