When a search engine visits a site and sees that the data has not changed

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Robots.txt file
This file shows search engines which pages to index and which not. It is not a priority for Google right now, but Yandex 100% follows what is written in robots.txt.
This file is always located at site . ru / robots . txt . Be sure to check if it is closed from indexing. We have not seen this yet, but theoretically it can happen.

Main mirror
Let 's say we have two domainan venezuela consumer email list From the point of view of search engines , these are two different resources with the same content - which means they have no place in the top results. In addition, if users enter different addresses, the link mass will be "smeared" between the two options.

The main mirror is the address that the search engine indexes. It is configured in the robots.txt file, as well as in the Google and Yandex webmaster panels. In addition, the developer or SEO specialist must "glue" the mirrors in the htaccess file to redirect all pages to the desired option.

Caching Headers
Each site contains information about what has changed there recently: images, texts, headings. If everything is set up correctly, the site gives this information to the search engine using the Last-Modified header and the server's response to the If-Modified-Since request.

, it does not process the page, but restores it from the cache. This reduces the load on the server and speeds up indexing.

An SEO specialist should ensure that caching headers work correctly and the server returns the correct response to the If-Modified-Since request. You can check the operation using the Last-Modified service: