🤖 Overview

chemiede-nodebot is a web crawler operated by CHEMIE.DE, a German chemical information portal, used to index chemistry‑related web content for its search and database services. Its purpose is to aggregate publicly available chemical compound data, safety datasheets, and research publications to support the CHEMIE.DE platform, which serves professionals and researchers in the chemical industry.

🌐 Technical Behavior

The bot primarily crawls HTTP and HTTPS sites, focusing on pages with chemical identifiers such as CAS numbers, molecular formulas, and structured data formats like XML or RDF. It employs a moderate crawl rate, typically sending 1–2 requests per second per domain, and uses the Node.js runtime environment (evidenced by its User‑Agent string). IP ranges are not publicly documented, but the bot appears to originate from German‑based IP addresses associated with the CHEMIE.DE infrastructure. It follows standard HTTP/1.1 protocols and may issue conditional GET requests with If‑Modified‑Since headers to respect cache freshness.

📋 robots.txt Compliance

Based on a review of CHEMIE.DE’s own robots.txt and public logs from crawled sites, chemiede-nodebot is known to respect Disallow directives. The bot checks robots.txt at the start of each crawl session and caches the rules for up to 24 hours. There are no documented instances of the bot ignoring disallowed paths on major chemistry domains.

🔍 Detection Indicators

The primary identification is the User‑Agent string: chemiede-nodebot/1.0 (with possible version variants). It also sends a From header containing [email protected] for contact purposes. Behavioral fingerprints include a distinct request pattern that always includes an Accept header of text/html,application/xhtml+xml and a Accept‑Language of de or en.

📊 Data Usage

Collected data is used exclusively for the CHEMIE.DE search engine, which indexes chemical compounds, suppliers, and safety information. The data is also used to populate its database for research queries, but it is not used for AI training or language model development. No public documentation indicates any involvement with generative AI or large‑scale analytics beyond search indexing.

⚙️ Rate Limiting Policy

CHEMIE.DE encourages site owners to rate‑limit chemiede-nodebot to a reasonable threshold, such as 10 requests per minute per IP, to prevent excessive load on smaller servers. The policy rationale is that while the bot is legitimate, its moderate crawl rate can still impact bandwidth‑constrained chemistry websites; thus, threshold‑based blocking is recommended for environment‑specific protection.

ⓘ 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.