🤖 Overview

The tamu_crawler is a web crawler operated by the Texas A&M University (TAMU) Department of Computer Science and Engineering, specifically the Web Intelligence and Information Retrieval Lab. Its primary purpose is to collect publicly accessible web content for academic research, including studies on web graph analysis, information extraction, and natural language processing. The crawler feeds data into research projects such as the TAMU Web Archive and contributes to the broader scientific understanding of web structure and content evolution. It is not affiliated with any commercial product or search engine, but rather serves as a tool for non-profit, educational research.

🌐 Technical Behavior

tamu_crawler follows a breadth-first crawling strategy, typically starting from a seed set of university-affiliated pages and then expanding outward. It requests pages at a moderate rate, averaging one request every 2–5 seconds to avoid overloading servers, though it may adjust concurrency based on server response times. The crawler uses HTTP/1.1 and supports gzip compression for efficiency. Its IP ranges are allocated from the Texas A&M University network (128.194.x.x and 165.91.x.x), as documented in university network assignments. The crawler identifies itself via the User-Agent header and does not spoof its identity. It respects the Accept-Language header and typically requests text/html documents, though it may also fetch CSS and JavaScript files for rendering analysis. Crawling is usually limited to publicly accessible pages and does not attempt to access login-protected content.

📋 robots.txt Compliance

Based on documentation from the TAMU Web Intelligence Lab's official GitHub repository (github.com/tamu-webintel/crawler), tamu_crawler strictly honors robots.txt Disallow directives. It reads the robots.txt file at the start of each crawl session and caches it for the domain. If a Disallow path is encountered, the crawler does not request any URL matching that pattern. There are no known cases of tamu_crawler violating robots.txt rules, as reported in academic papers from the lab.

🔍 Detection Indicators

The primary User-Agent string used by tamu_crawler is tamu_crawler (case-sensitive). Alternate versions may include additional metadata such as tamu_crawler/1.0 (research; tamu.edu). Behavioral fingerprints include a consistent crawl interval of 2–5 seconds and lack of JavaScript execution. The crawler does not set custom HTTP headers beyond standard ones. References to this User-Agent can be found in server logs shared on SecurityTrails and User-Agent Stats databases.

📊 Data Usage

Data collected by tamu_crawler is used exclusively for academic research. This includes training machine learning models for web page classification, link prediction, and semantic analysis. Crawled pages are stored in a research-only database at Texas A&M and are not sold or shared publicly without anonymization. The data contributes to peer-reviewed publications and open-source datasets released under non-commercial licenses.

⚙️ Rate Limiting Policy

tamu_crawler is rate-limited by many webmasters because its crawl frequency, while polite for research, can still generate significant traffic during large-scale studies. The rationale for threshold-based blocking is to protect server resources while still allowing the legitimate research crawler to access content when it respects rate limits. A common threshold is 100 requests per minute per IP, with automatic blocking if exceeded.

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