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Last updated: May 09, 2022
CMLABS' SEO TERMS
WHAT IS ROBOTS.TXT?
Robot.txt is a file used by search engines’ crawlers in your website to classify pages that people can visit. In certain cases, web developers provide a PUBLIC page for users, not search engines such as Google, Bing, and Yahoo.
The purpose of this file is a robot exclusion protocol. It is a de facto standard in the communication law and a border between websites and non-human users.
Robots exclusion protocol or robots txt allows web developers to decide in which part/file/folder of their website that can be accessed by bot or crawler.
Samples of Codes or Robots.txt Syntax
user-agent: Googlebot disallow: /login user-agent: Googlebot-news disallow: /media user-agent: Googlebot-image
Based on the syntax sample above, here is the explanation:
- Googlebot user-agent is prohibited to crawl into the /loginfolder.
- Googlebot-news user-agent is prohibited to crawl into the /media folder.
- Googlebot-image user-agent is allowed to look over into all of the folders inside the www.cmlabs.co website without any limitations.
Sample and Implementation of robots.txt URL
In general cases, robots.txt implementation is NOT VALID for a subdomain, protocol, and port. However, it will be VALID for all files in all of the sub-directories on the host, protocol, and port.
Check the sample location of the robots.txt file in the directory of the website server:
EXAMPLE OF VALID http://robots.co/robots.txt http://robots.co/folder/file/robots.txt
EXAMPLE OF INVALID http://other.cmlabs.co/robots.txt https://cmlabs.co/robots.txt http://cmlabs.co:8181/robots.txt
When this page is published (on May 21st, 2020), the definition and implementation of the robots.txt are only applicable to Google. In another word, other search engines such as Bing, Yahoo, Yandex, etc do not always use the same standard.
Robots.txt is not the right file to be used to hide a file or page from the crawler of search engines.
The right answer for: what should we do to hide files from Google? Is by inserting nonindex tag.
<meta name="robots" content="noindex"> <meta name="googlebot" content="noindex">
HTTP/1.1 200 OK (…) X-Robots-Tag: noindex (…)
Changes in Protocol Standards
On July, 1st 2019, Google through its official blog announced that robots.txt protocol was prepared to be the Internet standard. It means that all of the search engines will be agreed to this provision.
User-agent / bot
User-agent is a robot that is used by search engines to crawl all websites on the internet.
Find other important terms in the following SEO Terms:
Note: We have attached some of the most common questions asked by users below, along with their answers. To use the cmlabs Keyword Ranking Tracker application, you don't need to request for a quote from marketing. Please click login to the application.
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