Do I need robots.txt checks in a crawler pipeline?

Yes—if your crawler fetches public websites, you generally should include robots.txt checks in the pipeline.

Why

• Respect site owner rules: robots.txt tells crawlers what paths are allowed or disallowed.
• Reduce legal / compliance risk: It’s not a legal shield by itself, but ignoring it can create problems.
• Avoid unnecessary load: It helps prevent crawling content the site explicitly doesn’t want crawled.
• Operational best practice: Many sites expect well-behaved bots to honor it.

Where to put it in the pipeline

Typically, check robots.txt before scheduling or fetching a URL:

1. Normalize URL
2. Check cache for robots.txt rules for that host
3. Fetch/update robots.txt if needed
4. Decide allow/deny
5. Only then enqueue/fetch the page

Things to keep in mind

• robots.txt is per host and usually per scheme/port.
• You should cache it and revalidate periodically, not fetch it for every URL.
• Be careful with user-agent-specific rules.
• Also consider crawl-delay, if you choose to support it (not standard everywhere).
• robots.txt is not an authentication or security mechanism; don’t treat disallowed paths as private.

When you might skip it

• Crawling your own infrastructure where you control policy.
• Internal/test environments.
• If the crawler is for a very narrow use case and you’ve explicitly decided not to comply—but that’s usually a bad idea for public web crawling.

Bottom line

For a production web crawler, yes, add robots.txt checks as a normal part of the pipeline.

If you want, I can also show:

• a simple crawler pipeline design with robots handling,
• code for parsing/enforcing robots.txt,
• or best practices for caching and rate limiting.