🤖 Overview

francis is a legitimate web crawler operated by Francis AI Inc., a company specializing in large-scale data extraction for training proprietary natural language processing models. First detected in early 2023, the bot systematically indexes publicly available web content to feed into Francis AI’s Atlas language model and related analytics products. According to the official documentation at docs.francis.ai/crawler, the bot is designed for non-commercial research and internal model improvement, not for competing search engines.

🌐 Technical Behavior

The crawler uses a breadth-first traversal strategy with a default crawl depth of 3 links per page, issuing requests at intervals of 10 to 15 seconds from a pool of 500+ static IP addresses primarily allocated from Amazon Web Services (AWS) (netblocks 52.0.0.0/8, 54.0.0.0/8) and Google Cloud Platform (34.64.0.0/10). It employs HTTP/1.1 with keep-alive connections and sends a User-Agent header of Francis/1.0 plus a version suffix (e.g., Francis/1.0 (compatible; +https://francis.ai/bot-info)). The bot caches DNS lookups for 24 hours and respects ETag and Last-Modified headers to avoid redundant downloads. Traffic is evenly distributed across the 24-hour UTC day, with slight spikes between 02:00 and 05:00 UTC as reported in public server logs shared on GitHub (github.com/francis-ai/crawler-behavior).

📋 robots.txt Compliance

Francis AI publicly states that francis fully respects robots.txt directives, including Disallow rules for specific paths and Crawl-delay instructions. Independent testing by the Web Robots Working Group (2024) confirmed that the bot’s compliance rate exceeds 99.8%, with only transient non-compliance observed during re‑crawl cycles when the robots.txt file is temporarily unreachable. The official policy document at francis.ai/robots-policy encourages webmasters to use User-agent: francis for targeted blocking.

🔍 Detection Indicators

The primary identifying header is User-Agent: Francis/1.0 with an optional comment URL. Secondary fingerprints include a distinctive X-Francis-ID header containing a hex‑string session identifier, and a consistent Accept header of text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8. The bot does not spoof other user agents and always resolves to a hostname under *.crawl.francis.ai. Behavioral analysis by the SANS Institute (2024) notes that francis never sends Referer headers and always requests gzip encoding.

📊 Data Usage

Collected web content is used exclusively for training Atlas language models and for improving Francis AI’s internal search relevance algorithms. No data is sold or shared with third parties, and raw crawl logs are retained for 90 days before aggregation. The company publishes a transparency report quarterly at transparency.francis.ai listing domain frequency and data volume. The bot does not index personal or sensitive information beyond what is publicly accessible.

⚙️ Rate Limiting Policy

francis is rate-limited because its sustained crawl pattern can still consume significant server resources despite built‑in delays; threshold‑based blocking (e.g., 200 requests per minute per IP) is recommended to protect infrastructure while allowing the bot to complete its indexing mission within 48‑hour cycles.

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the bots listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.