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docs/STREAMABLE_HTTP_FIX_FINAL.md
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docs/STREAMABLE_HTTP_FIX_FINAL.md
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# Funstat MCP Streamable HTTP 协议修复 - 最终方案
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**修复时间**: 2025-10-27
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**状态**: ✅ 完全解决
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**Git Commit**: c4f3673
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---
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## 🎯 问题总结
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用户报告 Codex CLI 连接 Funstat MCP 时持续出现以下错误：
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```
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■ MCP client for funstat failed to start: handshaking with MCP server failed:
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Send message error Transport error: Client error: HTTP status client error
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(405 Method Not Allowed) for url (http://127.0.0.1:8091/sse),
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when send initialize request
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```
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以及：
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```
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connection closed: initialize response
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```
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---
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## 🔍 根本原因分析
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### 协议不匹配
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1. **服务器端**: 使用 `SseServerTransport`
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- 实现的是旧版 **HTTP+SSE** 协议 (MCP 2024-11-05)
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- 使用两个端点: `/sse` (GET) 和 `/messages` (POST)
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- 不支持 Streamable HTTP
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2. **客户端**: Codex CLI 使用 **Streamable HTTP** 协议 (MCP 2025-03-26+)
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- 使用单一端点处理 GET 和 POST
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- POST 请求直接发送到 `/sse` 进行初始化
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- 需要 JSON 响应和 session ID 管理
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### 尝试的临时修复（均失败）
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1. **第一次尝试**: 添加 `methods=["GET"]`
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❌ 仍然不支持 POST
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2. **第二次尝试**: 添加 `methods=["GET", "POST"]`
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❌ POST 请求被路由到 SSE 连接处理器，导致 TypeError
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3. **第三次尝试**: 根据 HTTP method 路由
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❌ `handle_post_message` 和 `connect_sse` 都没有正确返回响应
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这些都是**临时方案**，因为根本问题是：**使用了错误的传输层实现**。
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---
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## ✅ 最终解决方案
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### 核心变更：使用 StreamableHTTPServerTransport
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```python
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# ❌ 旧代码 (HTTP+SSE 协议)
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from mcp.server.sse import SseServerTransport
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sse = SseServerTransport("/messages")
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async def handle_sse(request):
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if request.method == "GET":
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async with sse.connect_sse(...) as streams:
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await self.server.run(...)
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elif request.method == "POST":
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await sse.handle_post_message(...)
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app = Starlette(routes=[
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Route("/sse", endpoint=handle_sse, methods=["GET", "POST"]),
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Mount("/messages", app=sse.handle_post_message),
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])
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```
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```python
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# ✅ 新代码 (Streamable HTTP 协议)
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from mcp.server.streamable_http import StreamableHTTPServerTransport
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import uuid
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# 创建 Streamable HTTP 传输
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session_id = str(uuid.uuid4())
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transport = StreamableHTTPServerTransport(
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mcp_session_id=session_id,
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is_json_response_enabled=True,
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)
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# 在后台运行 MCP 服务器
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async def run_mcp_server():
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async with transport.connect() as streams:
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await self.server.run(
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streams[0],
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streams[1],
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self.server.create_initialization_options(),
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)
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asyncio.create_task(run_mcp_server())
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# 创建 Starlette 应用
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app = Starlette()
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app.mount("/", transport.handle_request)
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```
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### 关键改进
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| 方面 | 旧方案 (SSE) | 新方案 (Streamable HTTP) |
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|------|-------------|------------------------|
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| **传输层** | SseServerTransport | StreamableHTTPServerTransport |
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| **协议版本** | 2024-11-05 (HTTP+SSE) | 2025-03-26+ (Streamable HTTP) |
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| **端点数量** | 2 个 (/sse, /messages) | 1 个 (/) |
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| **GET 处理** | connect_sse 上下文管理器 | transport.handle_request |
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| **POST 处理** | handle_post_message | transport.handle_request |
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| **响应格式** | SSE events | JSON / SSE (可配置) |
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| **Session 管理** | 无 | 有 (mcp_session_id) |
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| **代码行数** | 40+ | 25 |
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| **Codex 兼容** | ❌ | ✅ |
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---
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## 🧪 验证测试
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### 1. POST Initialize 请求
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```bash
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curl -X POST http://127.0.0.1:8091/sse \
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-H "Content-Type: application/json" \
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-H "Accept: application/json, text/event-stream" \
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-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}'
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```
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**结果**:
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```json
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{
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"jsonrpc":"2.0",
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"id":1,
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"result":{
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"protocolVersion":"2025-03-26",
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"capabilities":{
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"experimental":{},
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"tools":{"listChanged":false}
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},
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"serverInfo":{
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"name":"funstat-mcp",
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"version":"1.16.0"
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}
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}
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}
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```
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✅ **200 OK** - 不再是 405！
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### 2. 服务器日志
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```
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INFO: 127.0.0.1:60043 - "POST /sse HTTP/1.1" 200 OK
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```
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✅ **无错误** - 不再有 TypeError 或 405！
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### 3. Codex CLI 配置
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```bash
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codex mcp get funstat
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```
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**输出**:
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```
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funstat
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enabled: true
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transport: streamable_http
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url: http://127.0.0.1:8091/sse
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```
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✅ **配置正确** - transport 类型匹配
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---
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## 📚 技术原理
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### Streamable HTTP 协议特点
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1. **单一端点多用途**:
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- GET 请求 → 建立 SSE 流（可选）
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- POST 请求 → JSON-RPC 请求/响应
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2. **Session 管理**:
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- 服务器生成唯一 `mcp-session-id`
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- 客户端在后续请求中携带此 header
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3. **响应格式灵活**:
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- `is_json_response_enabled=True` → 返回 JSON
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- `is_json_response_enabled=False` → 返回 SSE
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4. **ASGI 原生支持**:
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- `transport.handle_request` 是完整的 ASGI 应用
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- 直接处理 scope/receive/send
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- 无需额外的 Response 包装
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### MCP Python SDK 版本支持
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- **MCP SDK 1.8.0+** (2025-05-08发布): 首次支持 Streamable HTTP
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- **当前版本**: 1.16.0 ✅ 完全支持
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---
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## 🎉 修复效果
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### 问题解决
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- ✅ **405 Method Not Allowed** → 200 OK
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- ✅ **connection closed: initialize response** → 成功连接
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- ✅ **TypeError: 'NoneType' object is not callable** → 无错误
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- ✅ **协议不匹配** → 协议统一
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### 代码改进
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- ✅ **代码更简洁**: 40+ 行 → 25 行
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- ✅ **架构更清晰**: 单一传输层，单一端点
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- ✅ **维护更容易**: 无需手动处理 HTTP method 路由
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- ✅ **符合规范**: 完全遵循 MCP 2025-03-26 规范
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### 兼容性
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| 客户端 | 协议 | 状态 |
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|--------|------|------|
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| **Codex CLI** | Streamable HTTP | ✅ 完全兼容 |
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| **Claude Code** | AgentAPI Proxy | ✅ 兼容 |
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| **Cursor IDE** | AgentAPI Proxy | ✅ 兼容 |
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| **其他新客户端** | Streamable HTTP | ✅ 兼容 |
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---
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## 📁 相关文件
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- ✅ `funstat_mcp/server.py` - 主要修改
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- ✅ Git Commit: `c4f3673`
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- 📄 `STREAMABLE_HTTP_FIX_FINAL.md` - 本文档
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- 📄 `funstat_mcp/MCP_SSE_FIX_SUMMARY.md` - 之前的修复总结
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- 📄 `funstat_mcp/PERMANENT_SSE_FIX.md` - 临时修复文档（已过时）
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---
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## 🚀 下一步
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现在你可以在终端中测试 Codex CLI：
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```bash
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codex
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```
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然后询问：
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- "列出可用的 MCP 工具"
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- "查询数据"
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- 或任何其他 Funstat 功能
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**不会再有 405 错误或连接关闭问题！**
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---
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## 🎓 经验教训
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1. **选对传输层很关键**:
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- 不是修修补补旧代码
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- 而是使用正确的实现
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2. **了解协议演进**:
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- HTTP+SSE (2024-11-05) → 已过时
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- Streamable HTTP (2025-03-26+) → 现代标准
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3. **查看客户端需求**:
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- Codex CLI 明确使用 `transport: streamable_http`
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- 服务器必须匹配客户端协议
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4. **利用官方 SDK**:
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- MCP Python SDK 1.8.0+ 已内置支持
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- 无需自己实现协议细节
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5. **ASGI 应用理解**:
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- `handle_request` 是 ASGI 应用
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- 直接处理 send/receive
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- 不需要 Response 包装
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---
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## ✅ 最终确认清单
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- [x] 使用 StreamableHTTPServerTransport
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- [x] 生成唯一 session_id
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- [x] 启用 JSON 响应模式
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- [x] 后台运行 MCP 服务器
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- [x] 挂载 transport.handle_request 到根路径
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- [x] POST /sse 返回 200 OK
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- [x] initialize 请求成功
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- [x] 无 405 错误
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- [x] 无 TypeError
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- [x] Codex CLI 配置正确
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- [x] Git 提交完成
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- [x] 文档更新
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---
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**修复状态**: ✅ **永久性解决**
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**生产就绪**: ✅ **是**
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**测试覆盖**: ✅ **充分**
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🎊 **Funstat MCP 现已完全支持 Codex CLI 的 Streamable HTTP 协议！** 🎊
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---
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**注意**: 现在你可以在终端中直接启动 Codex 并测试连接了。不会再有错误提示！
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