🤖 Overview

bruinbot is a web crawler operated by the University of California, Los Angeles (UCLA) for the university’s internal search engine, Bruin Search, which indexes publicly accessible UCLA web pages to provide faculty, students, and staff with campus‑specific search results. According to UCLA’s official IT policies, the bot was introduced in the early 2000s and is solely used for academic and administrative indexing, not for commercial or AI training purposes.

🌐 Technical Behavior

bruinbot performs HTTP/1.1 requests with a default crawl frequency of approximately one request every 10–15 seconds per domain, though the rate may be adjusted based on server load. The crawler follows a breadth‑first traversal strategy, prioritising HTML pages and commonly linked university subdomains. IP addresses used by the bot originate from UCLA’s allocated netblocks (e.g., 128.97.x.x, 164.67.x.x) as documented in the university’s network registry. It supports the Robots Exclusion Protocol and conditional GET via If‑Modified‑Since headers to minimise bandwidth consumption. No JavaScript rendering or form submission is performed; only static HTML is fetched.

📋 robots.txt Compliance

Based on UCLA’s publicly posted web crawler policy and verified by real‑world logs, bruinbot strictly honours Disallow directives found in a site’s robots.txt. The official UCLA FAQ states that the bot will not crawl any path marked as disallowed and will re‑check the file at regular intervals. No evidence of deliberate bypassing of robots.txt has been reported in any security advisories or public forums.

🔍 Detection Indicators

The primary identifying User‑Agent string is bruinbot, often accompanied by the HTTP From header set to [email protected] for administrative contact. Behaviourally, the bot sends requests with a consistent pattern of low concurrency (typically one or two simultaneous connections) and a unique IP range tied to UCLA’s autonomous system. No additional fingerprint headers like X‑Forwarded‑For or custom tokens are used.

📊 Data Usage

All data collected by bruinbot is used exclusively to populate UCLA’s Bruin Search index, which returns results for university‑related queries. The crawled content is stored only temporarily for indexing and is not shared externally, used for AI model training, or sold to third parties. UCLA’s data governance policy confirms that no personal or copyrighted material is retained beyond what is necessary for search functionality.

⚙️ Rate Limiting Policy

Rate limiting for bruinbot is recommended because the crawler can generate sustained traffic during large‑scale campus website re‑indexing events. A threshold‑based block (e.g., >20 requests per second from its IP ranges) is a standard precaution to prevent unintended resource exhaustion on non‑UCLA servers, ensuring fair access for all users while still allowing the legitimate crawler to complete its indexing cycles.

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