Secure Fetch

This project implements a secure URL fetching tool using FastMCP.

- Python 3.7+
- uv (Python package installer and environment manager)
- Create a new virtual environment and install dependencies:

uv venv source .venv/bin/activate uv pip install fastmcp requests

- Set the allowlist environment variable (optional):

export SECURE_FETCH_ALLOWLIST="example.com,trusted-domain.org"

- Fetches URLs securely
- Resolves domains to IPs
- Checks for private/internal IPs
- Handles redirects (up to 3)
- Supports custom HTTP methods and headers
- Uses an allowlist for trusted domains/IPs

- The tool prevents access to private/internal IPs unless explicitly allowed
- Only HTTP and HTTPS schemes are permitted
- SNI is set to match the hostname for HTTPS connections

Once the script is running, you can use thefetch_urlfunction to securely fetch URLs. The function will return a dictionary containing the status code, response body, and content length.

This tool is designed for secure URL fetching. Always review and understand the code before using it in your environment.

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