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@trishchuk/mcp-fetch-server

by x51xxx

@trishchuk/mcp-fetch-server

npm version License: MIT MCP Compatible Node.js

Ein leistungsstarker Model Context Protocol (MCP) Server, der ein gegen Bots resistentes fetch-Werkzeug für KI-Agenten (Claude Code, Claude Desktop, Cursor, Windsurf, Cline, Antigravity usw.) bereitstellt.

Angetrieben von @trishchuk/fetch – einem nativen HTTP-Client im Stil von curl-impersonate, der präzise echte Browser TLS (JA3/JA4, ClientHello) und HTTP/2-Fingerabdrücke nachahmt.


🚀 Warum dieser Server?

Standard-Node.js/Undici HTTP-Clients werden von modernen Bot-Schutzsystemen (Cloudflare Turnstile / Under Attack Mode, DataDome, PerimeterX / HUMAN, Akamai, Kasada, AWS WAF) sofort erkannt und blockiert.

Darüber hinaus scheitern standardmäßige MCP-Fetching-Werkzeuge oft an großen Nutzlasten oder sprengen die LLM-Token-Kontexte.

@trishchuk/mcp-fetch-server löst beide Probleme:

  1. Realistische Browser-Imitation: Repliziert exakte Cipher-Suites, TLS-Erweiterungen, ALPN-Reihenfolge und HTTP/2-Einstellungsrahmen moderner Browser (Chrome, Safari, Firefox).

  2. LLM-kontextsichere Kürzung: Streamt und begrenzt Antwortkörper auf 2 MB (maxResponseBytes). Zu große Seiten werden sauber gekürzt und mit "truncated": true markiert, anstatt mit Fehlern abzustürzen.

  3. Zustandsbehaftete Sitzungen: Behält Cookies, Login-Zustände und Verbindungspools über mehrere Agenten-Werkzeugaufrufe hinweg mit dem Parameter session bei.

  4. Intelligente Kodierung: Erkennt automatisch MIME-Typen und gibt sauberen UTF-8-Text für HTML/JSON/XML oder Base64 für Binärdateien (Bilder, PDFs, Dokumente) zurück.


Related MCP server: smart-webfetch-mcp

✅ Voraussetzungen

  • Node.js >= 24 – erforderlich von @trishchuk/fetch.

  • Vorgefertigte native Binärdateien werden für macOS (arm64, x64), Linux (x64/arm64, glibc und musl) und Windows (x64) ausgeliefert. Andere Plattformen werden vom zugrunde liegenden Client nicht unterstützt.


📦 Installation & Einrichtung

Option 1: Ausführen mit npx (Keine Installation erforderlich)

Sie können den Server direkt via npx ausführen:

npx -y @trishchuk/mcp-fetch-server

Option 2: Globale oder lokale Installation

# 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

⚙️ MCP-Client-Konfiguration

Claude Code

Direkt über die CLI hinzufügen:

# 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.js

Claude Desktop

Zu Ihrer claude_desktop_config.json hinzufügen:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

  • Windows: %APPDATA%\Claude\claude_desktop_config.json

  • Linux: ~/.config/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "fetch": {
      "command": "npx",
      "args": ["-y", "@trishchuk/mcp-fetch-server"]
    }
  }
}

Cursor / Windsurf / Antigravity (.mcp.json)

Erstellen oder aktualisieren Sie .mcp.json in Ihrem Arbeitsbereich:

{
  "mcpServers": {
    "fetch": {
      "command": "npx",
      "args": ["-y", "@trishchuk/mcp-fetch-server"]
    }
  }
}

🛠️ Werkzeugreferenz: fetch

Eingabeparameter

Parameter

Typ

Standard

Beschreibung

url

string

erforderlich

Ziel-absolute URL (z. B. https://example.com/api).

method

string

"GET"

HTTP-Methode (GET, POST, PUT, DELETE, PATCH, HEAD usw.).

headers

object

undefined

Anfrage-Header als Schlüssel-Wert-Paare ({"Authorization": "Bearer ..."}).

body

string

undefined

Anforderungskörper, gesendet als UTF-8-Zeichenkette (JSON, formularcodiert, Rohtext).

impersonate

string

"chrome_147"

Browser-Fingerabdruck-Voreinstellung (z. B. "chrome_147", "safari_26", "random").

platform

string

undefined

Deklariertes Betriebssystem: "windows", "macos", "linux", "android" oder "ios".

proxy

string

undefined

Proxy-URL: http://, https:// oder socks5:// (unterstützt user:pass@host:port).

session

string

undefined

Sitzungs-ID zur gemeinsamen Nutzung von Client-Verbindungen und Cookie-Jars über mehrere Aufrufe.

resolve

object

undefined

Benutzerdefiniertes DNS-Pinning (z. B. {"example.com": "1.2.3.4"}). SSRF-sicheres Testen.

redirect

string

"follow"

Umleitungsmodus: "follow", "manual" oder "error".

httpVersion

string

undefined

Erzwungene Protokollversion: "http1" oder "http2".

tlsMinVersion

string

undefined

Minimale TLS-Version: "1.0", "1.1", "1.2", "1.3".

tlsMaxVersion

string

undefined

Maximale TLS-Version: "1.0", "1.1", "1.2", "1.3".

timeoutMs

number

undefined

Gesamtzeitüberschreitung der Anfrage in Millisekunden.

maxResponseBytes

number

2097152

Körperlimit in Bytes (maximal 2 MB). Antworten, die dies überschreiten, werden sicher gekürzt.

encoding

string

"auto"

Format der Körperrückgabe: "auto" (Text für textuelle MIME-Typen, base64 für Binäres), "text" oder "base64".


Antwortschemata

1. Erfolgreicher HTTP-Austausch

Jeder abgeschlossene HTTP-Transfer gibt ein standardmäßiges JSON-Ergebnis zurück (einschließlich 404, 500 oder 3xx unter 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. Netzwerk-/Transportfehler

Wenn die Netzwerkverbindung fehlschlägt, eine Zeitüberschreitung auftritt oder die URL ungültig ist, gibt das Werkzeug isError: true zurück:

{
  "error": true,
  "code": "TIMEOUT",
  "message": "failed to read response body: request or response body error: operation timed out"
}

💡 Verwendungsbeispiele für Agenten

1. Bot-Erkennung auf geschütztem Ziel umgehen

{
  "url": "https://protected-site.com/products",
  "impersonate": "chrome_147",
  "platform": "macos",
  "headers": {
    "Accept-Language": "en-US,en;q=0.9"
  }
}
// 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. Routen über einen SOCKS5-Proxy

{
  "url": "https://geo-restricted.example.com",
  "proxy": "socks5://user:pass@proxy.example.com:1080",
  "impersonate": "safari_26"
}

4. Abrufen von Binär-Assets (Bilder, PDFs)

{
  "url": "https://example.com/report.pdf",
  "encoding": "base64"
}

5. DNS-Pinning für SSRF-sichere Aufnahme

{
  "url": "https://internal-origin.example.com/feed",
  "resolve": {
    "internal-origin.example.com": "192.0.2.42"
  },
  "redirect": "manual"
}

🔬 Impersonation-Voreinstellungen & Fingerabdrücke

@trishchuk/mcp-fetch-server unterstützt eine breite Palette von Browser-Fingerabdrücken:

  • Chrome: "chrome_100" … "chrome_149" (z. B. "chrome_147", "chrome_131", "chrome_116")

  • Edge: "edge_101" … "edge_148"

  • Opera: "opera_116" … "opera_131"

  • Firefox: "firefox_109", "firefox_133", "firefox_147" …, plus "firefox_private_136" und "firefox_android_135"

  • Safari: "safari_15.3" … "safari_26.4", plus iOS/iPad-Varianten ("safari_ios_26", "safari_ipad_26")

  • OkHttp (Android-Apps): "okhttp_3.9" … "okhttp_5"

  • Dynamisch: "random", "weighted_random" (rotiert Fingerabdrücke automatisch, pro session festgelegt)

Versionsnummern verwenden Unterstriche (chrome_147, nicht chrome147). Ein unbekannter Name schlägt sofort mit einem InvalidArg-Fehler fehl, der alle akzeptierten Varianten auflistet.


🧪 Entwicklung

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 publish

Die Tests starten den echten Server über stdio und steuern ihn mit einem MCP-Client gegen einen lokalen HTTP-Server, wobei die Kürzung an der Grenze, Umleitungsmodi, HEAD, Base64-Körper, Zeitüberschreitungen und Transportfehler abgedeckt werden.


📄 Lizenz

MIT © Taras Trishchuk

Available Tools

1 tool
fetchFetchA

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.

ParametersJSON Schema
NameRequiredDescriptionDefault
urlYesAbsolute URL to request.
bodyNoRequest body, sent as UTF-8 text (e.g. JSON string, form-encoded string).
proxyNoProxy URL: http://, https://, or socks5://, optionally with user:pass@.
methodNoHTTP method.GET
headersNoRequest headers.
resolveNoHostname-to-IP pinning, e.g. { "example.com": "192.0.2.1" }. Useful to pin DNS for SSRF-safety or A/B hosts.
sessionNoOpaque session id. Reusing it across calls keeps the same underlying client and cookie jar (e.g. to stay logged in).
encodingNoHow to return the body: "auto" picks text for text-like content-types and base64 otherwise.auto
platformNoDeclared OS for the fingerprint.
redirectNoRedirect handling. Defaults to "follow".
timeoutMsNoRequest deadline in milliseconds.
httpVersionNoForce HTTP/1.1 or HTTP/2 instead of negotiating.
impersonateNoBrowser fingerprint profile, e.g. "chrome_147", "safari_26", "random". Defaults to the library default.
tlsMaxVersionNo
tlsMinVersionNo
maxResponseBytesNoResponse 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

A4.1/5.0
Behavior4/5

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.

Conciseness5/5

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.

Completeness3/5

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.

Parameters3/5

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.

Purpose5/5

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.

Usage Guidelines4/5

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. 1 tool updatev0.1.0
    • First observedfetch

TDQS

A3.8/5.0

Scored across 1 tool

Disambiguation5/5

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.

Naming Consistency3/5

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.

Tool Count2/5

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.

Completeness2/5

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.

Maintenance

ActivitySlowing
ResponsivenessNo issues

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