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keybodhi

MCP-webfetch

by keybodhi

MCP-webfetch

通过 SOCKS5 代理抓取网页内容的 MCP 服务器。基于 opencode 官方 webfetch 实现,添加了代理支持。

功能

  • 通过 127.0.0.1:10808 SOCKS5 代理获取网页

  • 支持格式:markdown(默认)、text、html

  • HTML→Markdown 转换(TurndownService)

  • HTML→Text 提取(htmlparser2)

  • 自动跟进重定向(防循环检测)

  • Cloudflare 反爬检测 + 自动重试

  • MIME 类型校验(图片/二进制自动拒绝)

  • Body 大小限制(5MB)

Related MCP server: superFetch MCP Server

安装

# 1. 克隆或复制本目录
cd D:\workplace\MCP-webfetch

# 2. 安装依赖(htmlparser2 + turndown)
npm install

配置 opencode

opencode.json 中添加:

{
  "mcp": {
    "webfetch-proxy": {
      "type": "local",
      "command": ["node", "D:\\workplace\\MCP-webfetch\\webfetch-proxy.js"],
      "enabled": true
    }
  },
  "permission": {
    "webfetch": "deny"
  }
}
  • 项目级: 当前目录下的 opencode.json

  • 全局级: ~/.config/opencode/opencode.json

禁止内置 webfetch(可选)

permission 中设置 webfetch: "deny",让 AI 只能使用本 MCP 工具。

{
  "permission": {
    "webfetch": "deny"
  }
}

配置代理地址

编辑 webfetch-proxy.js 顶部:

const PROXY_HOST = "127.0.0.1";
const PROXY_PORT = 10808;

重启 opencode

每次修改配置后需要重启 opencode 生效。

测试

node -e "
const { spawn } = require('child_process');
const proc = spawn('node', ['D:\\\\workplace\\\\MCP-webfetch\\\\webfetch-proxy.js']);
proc.stdin.write(JSON.stringify({jsonrpc:'2.0',id:1,method:'initialize',params:{protocolVersion:'2024-11-05',capabilities:{},clientInfo:{name:'t',version:'1'}}})+'\n');
setTimeout(() => {
  proc.stdin.write(JSON.stringify({jsonrpc:'2.0',id:2,method:'tools/call',params:{name:'webfetch',arguments:{url:'https://httpbin.org/get',format:'text',timeout:5}}})+'\n');
}, 500);
setTimeout(() => { proc.kill(); process.exit(); }, 5000);
proc.stdout.on('data', (d) => { console.log(d.toString()); });
"

依赖

  • effect — 函数式运行时(HttpClient、Stream、Effect)

  • htmlparser2 — HTML 解析(文本提取)

  • socks-proxy-agent — SOCKS5 代理客户端

  • turndown — HTML→Markdown 转换

A
license - permissive license
-
quality - not tested
B
maintenance

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