🤖 Overview

mini-robot is a lightweight, open-source web crawler primarily developed and maintained by independent contributors, hosted on GitHub under the repository mini-robot/mini-robot. Its stated purpose is to provide a minimal, configurable crawler for website monitoring, SEO auditing, and link validation tasks. The project was first released in 2018 and is written in Python using libraries like Requests and BeautifulSoup. The bot is not associated with any commercial product; it is designed for personal and small-scale infrastructure use, often deployed by webmasters to check their own sites or by developers integrating it into CI/CD pipelines.

🌐 Technical Behavior

mini-robot performs sequential HTTP GET requests, defaulting to a crawl delay of 5 seconds between pages to avoid server overload. The crawler does not support JavaScript rendering; it only fetches raw HTML and follows same-domain links embedded in href attributes. Its IP ranges are not static — the source code allows users to specify any outbound proxy or use the default IP of the hosting machine. Official documentation on the GitHub wiki specifies that the bot respects the Crawl-Delay directive in robots.txt if set, but does not automatically cap its own concurrency. The crawler uses HTTP/1.1 and sends a User-Agent header of mini-robot/2.0 (version varies). It does not send a Referer header by default, and it accepts text/html, application/xml, and text/plain content types.

📋 robots.txt Compliance

Based on the project's README (source: https://github.com/mini-robot/mini-robot), mini-robot strictly parses the robots.txt file of each target domain before crawling. If a Disallow directive is present, the bot will skip those paths entirely. The documentation notes that the crawler also respects Allow overrides and Sitemap directives. However, the behavior is only guaranteed when the configuration flag respect_robots is set to True (the default). Users can disable compliance for testing purposes, but the official recommendation is to keep it enabled for production use.

🔍 Detection Indicators

The most reliable detection indicator is the User-Agent string: mini-robot/2.0 or mini-robot/1.0 (older versions). The crawler does not send custom headers like X-Robot-Identity. A behavioral fingerprint is the static crawl delay (5 seconds by default) and the absence of a Referer header. The crawler's request pattern shows a single-threaded, sequential access with no concurrent fetches, unlike many commercial bots. Additionally, the source code reveals that the bot includes a From header containing the operator's email only if explicitly configured, which is rare in practice.

📊 Data Usage

Data collected by mini-robot is used exclusively by the person or organization that deploys it. Typical applications include website health monitoring (e.g., detecting broken links, changes in page content), SEO auditing (checking meta tags, canonical URLs), and verifying server response codes. The bot does not share any data with third parties; all output is written to local log files or JSON reports. The GitHub project explicitly states that no data is sent to remote servers, and the crawler is designed to be fully self-contained for privacy.

⚙️ Rate Limiting Policy

mini-robot is rate-limited because its default crawl delay of 5 seconds can still generate a significant number of requests when scanning large sites over hours, potentially affecting server performance for shared hosts. The official documentation recommends that site operators set a custom Crawl-Delay in their robots.txt (e.g., Crawl-Delay: 10) to enforce a higher threshold. For web applications, a rate-limiting policy that blocks requests exceeding 12 requests per minute from a single IP — after verifying the User-Agent — is adequate to prevent disruption while allowing legitimate monitoring. The bot's design explicitly allows such throttling without impacting its core functionality.

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