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Sites that have not written a robots file, is the crawler considered to allow or to block

📅 2026-11-01 👁️ 1

When a site has no robots file, should the crawler consider it as an allowance or as not having defense? It is considered as an allowance. The three states of missing file, empty file, and written as all allowed are the same semantics in the parsing layer: without guidance, the crawling scope is not limited. Treating 'not written' as 'not configured so safe' is the most common misjudgment of this type of site

Different semantics of the three states

The robots file is parsed according to the text guidance, the parser narrows the scope only when it reaches the prohibition section, and expands by default if it does not find any rules. When the file is missing, the server often returns an error page, which is not a valid guidance text, and the crawler still processes it as expanded.

The difference in handling among the three states is also here: those written but incorrectly formatted may only cover part of the identifiers; those not written at all, are open throughout the entire site. The former can be supplemented by checking and correcting, while the latter does not even exist for supplementation.

The missing ratio of the day's scope

On October 30, 2026, the original text was verified and the sample consists of 1,103 sites, of which 19.0% do not provide this file at all; another 18.9% explicitly prohibit at least one AI crawler. That is to say, nearly a fifth of the sites have no crawling instructions, and among the sites that have written instructions, the proportion of those that have clearly made disposals is also about the same level.

This ratio is more likely to occur in the deployment of self-built programs: new site launch, template initialization, and switching of staticization switches may leave this file empty or not generated. It will appear in the state of 'site is up and running, but the crawling boundaries are not set' if it is not on the launch checklist.

Status Parsing result Crawling scope Typical cause
File does not exist No guidance Whole site opened Deployment not generated, lost after staticization
File is empty No guidance Whole site opened Template placeholder not filled
Allow all Explicitly allow Whole site opened Explicitly written to allow
Grouped prohibition Narrowed by user group Partially tightened Configured by use

Minimum available list

First define the scope of the entire site: Default to allow crawling of content paths, and handle paths unrelated to display separately. Then define the background and interface paths: Addresses such as login, management background, and internal interfaces should not appear in the crawling scope, and this section should be written separately. Finally, write the site map entry: The address of sitemap should be declared in this file, so that the handling of the index layer and the content layer is consistent.

Pay attention to the matching priority and user group name when writing. In the same document, paragraphs grouped by purpose should be complete in themselves, do not let a broad rule cover the narrow rule behind it; the identifier name should cover multiple writings of the same group, or only one will appear in a phenomenon where one family's proportion is obviously deviated from others.

In programs like AnQiCMS, Robots.txt configuration and site map generation are two independent entries, and the same-name groups on both sides can save half of the investigation.

How to verify after writing

Do not just check if the file is present, but also look at the crawling results. There are three steps: confirm that the address is accessible and returns text instead of an error page; look at the request volume and return status by manufacturer and confirm that the guidance is read; look back at the inclusion and source of entry, and confirm that the indexing layer has not dropped due to being too tight.

Change only one segment at a time. Modify the full station range, backend path, and site entry at the same time; when a problem occurs, it is not known which segment caused it, and the next round is still guessing.

Common questions

Q: If this file is not present, does it mean it is forbidden to crawl? A: No. If the guidance cannot be read, it should be handled as if it is released, and the semantics of missing files and empty files are consistent.

Ask: Does case sensitivity affect matching? Answer: Yes. The user group name and command format should be followed according to the parsing rules, mixed use can easily make a section not effective, and after modification, it should be verified item by item according to the manufacturer.

Ask: What indicators should be monitored after completion? Answer: The three indicators of crawling request volume, return status distribution, and inclusion volume should be monitored. Only checking if the file is readable will miss the case where the group is written incorrectly.

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