What is a robots.txt file for? First of all, let me digress a little. Even a novice webmaster knows how important the stage of website promotion is. Your website may have an excellent design and unique content, but at the same time be not too recognizable among the Internet community.
robots.txt serves to control the process of indexing the site on the part of the webmaster. In this file, you can specify to search engines which pages should not be indexed, limit the robot by the frequency of visits, specify the address of the site map, etc.
If there is no robots.txt file, it is assumed that no restrictions are imposed on the indexing of the site. Think about it, does this meet your requirements?
You can create robots.txt in any text editor, starting with Windows Notepad, but this is best done in advanced editors like Notepad++ or Notepad2.
robots.txt must have a specific syntax. A description of the structure of robots.txt can be found here.
The robots.txt file on the domain must be one and located at the root of the domain. That is, you can create several of them, but search robots will read and execute only the one that is at the root. Accordingly, there is no point in creating the rest of the robots.txt if they are in subdirectories.
If your CMS is delivered within the same domain, but in different directories, then you need to have one common robots.txt. This does not apply to the organization of the second CMS separately on the subdomain.
Each subdomain is logically a separate domain, so it can have a separate robots.txt file at its root. Accordingly, its instructions should be followed by search bots.
It is important for the search engine that the robots.txt is accessible through the web. The rest is determined for security reasons and the settings of your web server.
robots.txt does not guarantee you anything, so you should not rely on this file to hide secret data.
Yes. To do this, there is a special Crawl-delay directive. If the bot does not support it, but heavily loads the server, it makes sense to prohibit the bot from visiting the site altogether.
Yes. To do this, you need to create the appropriate block for the desired User-agent.
A list of the main search bots and a brief description of them can be found here.
You can recognize a bot by its IP address, but from the point of view of robots.txt only the User-agent is of practical importance.
Almost no way. Files perform a completely different role: robots.txt serves to create prescriptions for robots, while the .htaccess file is one of the configuration files of the web server and serves to manage it. robots.txt is prescriptive, while the directives of the .htaccess file are executed unquestioningly. Nevertheless, both of these files can be used together with both to control visits of robots, and, for example, to glue domains with www and without www.
Probably your robots.txt contains some errors.
First of all, read the list of the most common errors in the robots.txt file. Check the syntax of the directives, also the format in which the robots.txt file was created. Use the webmaster's tools. Back to the list
Yes of course. In this case, to analyze the reasons, it is best to resort to the help of webmaster tools from the leading search engines Yandex and Google. Back to the list
Check to see if robots.txt has a Disallow directive denying the path for your sitemap.
Relatively recently, Yandex began to support the concept of canonical pages. Specifying a canonical page allows you to specify a master URL if the same content becomes available at multiple addresses. Previously, Yandex used a different algorithm.
If you have the ability to change the content of the pages, you can use the ROBOTS meta tag to tell the robot how to index the page.
One of the main rules that help to avoid mistakes is to adhere to the rules of good manners when compiling your robots.txt.
Robots will only take into account the robots.txt that is at the root of the site. All robots.txt from subdirectories will not play any role for search robots.
The robots.txt file should be called exactly the same in any other way. All letters must be lowercase, otherwise, bots will assume that the robots.txt file is missing.
For example, the following spellings would be erroneous:
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