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mcp-server-proxy
Converts MCP protocol's SSE transport layer to a standard HTTP request/response.
3 years
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mcp-server-proxy
将 MCP 协议的 SSE 传输层转换为标准 HTTP 请求/响应的代理服务器,简化 MCP Server 的开发和使用。
为什么需要这个工具
MCP(Model Context Protocol)是一个开放协议,为 AI 应用提供了标准化的数据源和工具集成方案。目前 MCP 支持两种主要的传输协议:
-
Stdio 传输协议:
- 😫 需要在用户本地安装命令行工具,对运行环境有特定要求
- 😫 用户需要进行相应的环境配置
-
SSE(Server-Sent Events)传输协议:
- 👍 基于 HTTP 长连接实现,用户配置相对简单,主要是设置服务地址
- 😫 目前相关开发工具和示例相对较少
本工具通过以下方式简化 MCP Server 的开发和使用:
- 采用 SSE 传输协议与 MCP Client 交互,用户只需配置服务地址即可使用
- 将 MCP 工具调用转换为标准的 HTTP 请求/响应,开发者可以使用任意编程语言实现,无需关注 SSE 协议细节
功能特点
- 支持将 MCP 协议的 SSE 传输层转换为标准 HTTP 请求/响应
- 提供请求和响应的检查功能,主要用于研究 MCP Client 和 Server 的交互过程
- 目前已支持
initialize
、tools/list
、tools/call
三个方法
安装
go install github.com/leizongmin/mcp-server-proxy@latest
使用方法
该工具提供两个主要命令:
1. inspect 命令
用于检查请求和响应的内容,主要用于研究 MCP Client 和 Server 的交互过程:
mcp-server-proxy inspect <local_url> <target_url>
例如:
mcp-server-proxy inspect http://localhost:8080 http://example.com
2. serve 命令
启动代理服务器,将 MCP Client 的调用转换为标准 HTTP 请求/响应:
mcp-server-proxy serve <local_url> <target_url>
例如:
mcp-server-proxy serve http://localhost:8080 http://example.com
示例
项目包含一个 JavaScript 示例(位于 example/js-echo
目录),实现了简单的 echo 功能,不需要依赖 MCP 相关的 SDK,只需要处理几个简单的 HTTP 请求即可:
- 进入示例目录:
cd example/js-echo
本示例使用 Hono 框架实现,核心代码如下:
import { Hono } from "hono";
import { logger } from "hono/logger";
const app = new Hono();
app.use("*", logger());
app.post("/initialize", async (c) => {
const sessionId = c.req.query("sessionId");
const params = await c.req.json();
console.log("initialize: sessionId=%s, params=%j", sessionId, params);
return c.json({
protocolVersion: "2024-11-05",
capabilities: {
tools: {},
},
serverInfo: { name: "example-mcp-server", version: "1.0.0" },
});
});
app.post("/tools/list", async (c) => {
const sessionId = c.req.query("sessionId");
const params = await c.req.json();
console.log("tools/list: sessionId=%s, params=%j", sessionId, params);
return c.json({
tools: [
{
name: "echo",
description: "Echoes back the input",
inputSchema: {
type: "object",
properties: {
message: { type: "string", description: "Message to echo" },
},
required: ["message"],
additionalProperties: false,
$schema: "http://json-schema.org/draft-07/schema#",
},
},
],
});
});
app.post("/tools/call/:name", async (c) => {
const sessionId = c.req.query("sessionId");
const name = c.req.param("name");
const params = await c.req.json();
console.log(
"tools/call: sessionId=%s, name=%s, params=%j",
sessionId,
name,
params
);
return c.json({
content: [
{ type: "text", text: `SESSION ID: ${sessionId}` },
{ type: "text", text: `ECHO: ${params.arguments?.message}` },
],
});
});
export default app;
- 安装依赖:
npm install
- 启动服务器:
node server.js
- 启动代理服务器:
# 代理服务器监听 http://localhost:3002
# 代理服务器将请求转发到 http://localhost:3001
mcp-server-proxy serve http://localhost:3002 http://localhost:3001
- 配置 MCP Client:
- Type:
sse
- Server URL:
http://localhost:3002/sse
- 调用工具:
以 Cursor 为例,提交内容echo message "hello"
后,它会识别出来需要调用 echo
工具,此时会出现【Call Tool】按钮,点击次按钮确认后即可看到工具调用结果。
许可证
MIT
贡献
欢迎提交问题和 Pull Request!
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Reviews

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