@trishchuk/mcp-fetch-server
@trishchuk/mcp-fetch-server
Высокопроизводительный сервер Model Context Protocol (MCP), предоставляющий устойчивый к анти-ботам инструмент fetch для AI-агентов (Claude Code, Claude Desktop, Cursor, Windsurf, Cline, Antigravity и др.).
Работает на базе @trishchuk/fetch — нативного HTTP-клиента в стиле curl-impersonate, который точно имитирует TLS (JA3/JA4, ClientHello) и HTTP/2 отпечатки реальных браузеров.
🚀 Зачем этот сервер?
Стандартные HTTP-клиенты Node.js/Undici моментально блокируются современными системами защиты от ботов (Cloudflare Turnpike / Under Attack Mode, DataDome, PerimeterX / HUMAN, Akamai, Kasada, AWS WAF).
Более того, стандартные инструменты MCP для выборки часто сбоят при больших объёмах данных или раздувают контекст токенов LLM.
@trishchuk/mcp-fetch-server решает обе проблемы:
Реалистичная имитация браузера: Воспроизводит точные наборы шифров, TLS-расширения, порядок ALPN и кадры настроек HTTP/2 из современных браузеров (Chrome, Safari, Firefox).
Безопасное для контекста LLM усечение: Потоково загружает и ограничивает тело ответа 2 МБ (
maxResponseBytes). Слишком большие страницы аккуратно обрезаются и помечаются флагом"truncated": true, вместо того чтобы падать с ошибками.Сохраняемые сессии: Поддерживает cookies, состояние входа и пулы соединений между несколькими вызовами инструментов агента с помощью параметра
session.Умное кодирование: Автоматически определяет MIME-типы и возвращает чистый UTF-8 текст для HTML/JSON/XML или Base64 для бинарных файлов (изображения, PDF, документы).
Related MCP server: smart-webfetch-mcp
✅ Требования
Node.js >= 24 — требуется для
@trishchuk/fetch.Предварительно собранные нативные бинарные файлы поставляются для macOS (arm64, x64), Linux (x64/arm64, glibc и musl) и Windows (x64). Другие платформы не поддерживаются базовым клиентом.
📦 Установка и настройка
Вариант 1: Запуск через npx (установка не требуется)
Вы можете запустить сервер напрямую через npx:
npx -y @trishchuk/mcp-fetch-serverВариант 2: Глобальная или локальная установка
# Global
npm install -g @trishchuk/mcp-fetch-server
# Or clone & install locally
git clone https://github.com/x51xxx/mcp-fetch-server.git
cd mcp-fetch-server
npm install⚙️ Настройка MCP-клиента
Claude Code
Добавьте напрямую через CLI:
# Using npx (recommended)
claude mcp add fetch -- npx -y @trishchuk/mcp-fetch-server
# Or using local path
claude mcp add fetch -- node /path/to/mcp-fetch-server/src/index.jsClaude Desktop
Добавьте в ваш claude_desktop_config.json:
macOS:
~/Library/Application Support/Claude/claude_desktop_config.jsonWindows:
%APPDATA%\Claude\claude_desktop_config.jsonLinux:
~/.config/Claude/claude_desktop_config.json
{
"mcpServers": {
"fetch": {
"command": "npx",
"args": ["-y", "@trishchuk/mcp-fetch-server"]
}
}
}Cursor / Windsurf / Antigravity (.mcp.json)
Создайте или обновите .mcp.json в вашей рабочей области:
{
"mcpServers": {
"fetch": {
"command": "npx",
"args": ["-y", "@trishchuk/mcp-fetch-server"]
}
}
}🛠️ Справочник инструмента: fetch
Входные параметры
Параметр | Тип | По умолчанию | Описание |
|
| обязательно | Целевой абсолютный URL (например, |
|
|
| HTTP-метод ( |
|
|
| Заголовки запроса в виде пар ключ-значение ( |
|
|
| Тело запроса, отправляемое как UTF-8 строка (JSON, форма, простой текст). |
|
|
| Префикс отпечатка браузера (например, |
|
|
| Заявленная ОС: |
|
|
| URL прокси: |
|
|
| ID сессии для общего использования клиентских соединений и хранилища cookie между несколькими вызовами. |
|
|
| Кастомизация DNS (например, |
|
|
| Режим перенаправления: |
|
|
| Принудительная версия протокола: |
|
|
| Минимальная версия TLS: |
|
|
| Максимальная версия TLS: |
|
|
| Общий таймаут запроса в миллисекундах. |
|
|
| Лимит тела ответа в байтах (макс. 2 МБ). Ответы, превышающие лимит, безопасно обрезаются. |
|
|
| Формат возврата тела: |
Схемы ответа
1. Успешный HTTP-обмен
Любой завершённый HTTP-перевод возвращает стандартный JSON-результат (включая 404, 500 или 3xx при redirect: "manual"):
{
"status": 200,
"statusText": "OK",
"ok": true,
"url": "https://example.com/data",
"redirected": false,
"headers": {
"content-type": "application/json; charset=utf-8",
"cache-control": "max-age=3600"
},
"bodyEncoding": "text",
"body": "{\"message\": \"Hello world\"}",
"truncated": false
}2. Сетевой / транспортный сбой
Если сетевое соединение не удалось, истекло время ожидания или URL недействителен, инструмент возвращает isError: true:
{
"error": true,
"code": "TIMEOUT",
"message": "failed to read response body: request or response body error: operation timed out"
}💡 Примеры использования для агентов
1. Обход защиты от ботов на защищённом ресурсе
{
"url": "https://protected-site.com/products",
"impersonate": "chrome_147",
"platform": "macos",
"headers": {
"Accept-Language": "en-US,en;q=0.9"
}
}2. Многошаговый сбор данных с постоянной сессией (хранилище cookie)
// Step 1: Login / Obtain Session Cookie
{
"url": "https://example.com/api/login",
"method": "POST",
"session": "agent-crawler-01",
"headers": { "Content-Type": "application/json" },
"body": "{\"user\":\"admin\",\"password\":\"secret\"}"
}
// Step 2: Access protected resource (session cookies automatically preserved)
{
"url": "https://example.com/api/dashboard",
"session": "agent-crawler-01"
}3. Маршрутизация через SOCKS5-прокси
{
"url": "https://geo-restricted.example.com",
"proxy": "socks5://user:pass@proxy.example.com:1080",
"impersonate": "safari_26"
}4. Загрузка бинарных ресурсов (изображения, PDF)
{
"url": "https://example.com/report.pdf",
"encoding": "base64"
}5. DNS-привязка для безопасного приёма данных (SSRF)
{
"url": "https://internal-origin.example.com/feed",
"resolve": {
"internal-origin.example.com": "192.0.2.42"
},
"redirect": "manual"
}🔬 Префиксы имитации и отпечатки
@trishchuk/mcp-fetch-server поддерживает широкий спектр отпечатков браузеров:
Chrome:
"chrome_100"…"chrome_149"(например,"chrome_147","chrome_131","chrome_116")Edge:
"edge_101"…"edge_148"Opera:
"opera_116"…"opera_131"Firefox:
"firefox_109","firefox_133","firefox_147"…, а также"firefox_private_136"и"firefox_android_135"Safari:
"safari_15.3"…"safari_26.4", плюс варианты для iOS/iPad ("safari_ios_26","safari_ipad_26")OkHttp (Android-приложения):
"okhttp_3.9"…"okhttp_5"Динамические:
"random","weighted_random"(автоматически сменяет отпечатки, привязан кsession)
Номера версий используют подчёркивания (chrome_147, не chrome147). Неизвестное имя завершится ошибкой
InvalidArg, в которой будет перечислен каждый допустимый вариант.
🧪 Разработка
npm install
npm start # run the server over stdio
npm test # end-to-end smoke tests, no network required
npm run format # format with Biome
npm run lint # lint with Biome
npm run check # format + lint check, also run before publishТесты запускают реальный сервер через stdio и управляют им с помощью MCP-клиента, взаимодействующего с локальным HTTP-сервером,
покрывая усечение при лимите, режимы перенаправлений, HEAD, тела в base64, таймауты и транспортные ошибки.
📄 Лицензия
MIT © Taras Trishchuk
Available Tools
1 toolfetchFetchA
HTTP fetch backed by @trishchuk/fetch: a curl-impersonate-style client that emulates a real browser TLS/HTTP2 fingerprint (JA3/JA4, ClientHello, ALPN) so requests are not flagged by fingerprint-based bot detection (Cloudflare, DataDome, PerimeterX, etc.) the way Node's default HTTP client is. Use it for GET/POST/etc. against sites that block or challenge plain scrapers.
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | Absolute URL to request. | |
| body | No | Request body, sent as UTF-8 text (e.g. JSON string, form-encoded string). | |
| proxy | No | Proxy URL: http://, https://, or socks5://, optionally with user:pass@. | |
| method | No | HTTP method. | GET |
| headers | No | Request headers. | |
| resolve | No | Hostname-to-IP pinning, e.g. { "example.com": "192.0.2.1" }. Useful to pin DNS for SSRF-safety or A/B hosts. | |
| session | No | Opaque session id. Reusing it across calls keeps the same underlying client and cookie jar (e.g. to stay logged in). | |
| encoding | No | How to return the body: "auto" picks text for text-like content-types and base64 otherwise. | auto |
| platform | No | Declared OS for the fingerprint. | |
| redirect | No | Redirect handling. Defaults to "follow". | |
| timeoutMs | No | Request deadline in milliseconds. | |
| httpVersion | No | Force HTTP/1.1 or HTTP/2 instead of negotiating. | |
| impersonate | No | Browser fingerprint profile, e.g. "chrome_147", "safari_26", "random". Defaults to the library default. | |
| tlsMaxVersion | No | ||
| tlsMinVersion | No | ||
| maxResponseBytes | No | Response body cap in bytes (max 2097152, i.e. 2MB, to keep tool output usable). A larger body is truncated to this size and flagged with "truncated": true, not rejected. |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses the critical behavioral trait of browser fingerprint emulation (JA3/JA4, TLS, HTTP/2) to avoid detection. Without annotations, this provides transparency about why requests succeed. However, it does not mention whether the tool is read-only or has side effects, though HTTP fetch is inherently non-destructive to local state.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is extremely concise: two sentences that front-load the core purpose and differentiator, followed by usage guidance. Every sentence serves a purpose, and there is no redundancy or filler.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has 16 parameters, no annotations, and no output schema, the description is somewhat incomplete. It does not explain what the tool returns (e.g., status code, headers, body format) or that the response is a standard HTTP response. While the schema covers some constraints like maxResponseBytes, the agent lacks clarity on what to expect after invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 88%, so the input schema already documents most parameters. The description adds general context about the underlying library and fingerprinting motivation but does not provide additional details on individual parameters beyond what schema descriptions offer. The baseline of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly identifies the tool as an HTTP fetch client with browser fingerprint emulation to bypass bot detection. It specifies the verb 'fetch', the resource (URLs), and the unique value proposition (curl-impersonate style). This distinguishes it from standard HTTP clients and makes its purpose immediately obvious.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly states when to use the tool: 'against sites that block or challenge plain scrapers'. It contrasts with Node's default HTTP client, implying an alternative. However, it does not list explicit sibling tools or provide when-not-to-use guidance, such as for sites without bot detection.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
1 tool update
v0.1.0- First observed
fetch
TDQS
Scored across 1 tool
With only a single tool, there is no possibility of confusion with other tools. The tool's purpose is clearly described and distinct by default.
With only one tool, there is no pattern to judge. The name 'fetch' is simple and conventional, matching common HTTP client terminology, but the lack of a verb_noun convention is neutral.
A single tool for an HTTP fetch server is too minimal. Most similar servers would include additional tools for managing headers, cookies, or caching, making this feel under-scoped for its stated purpose of scraping.
The server only provides a basic fetch tool with no support for managing sessions, handling redirects, managing cookies, or performing other common HTTP operations. This leaves significant gaps for any realistic scraping workflow.
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