To ensure that search engines do not perceive HTTP and HTTPS versions of a website as two different resources, it is necessary to configure a 301 redirect from HTTP to HTTPS. This process is akin to transferring the site to another domain. It must be a direct and straightforward redirection that does not include intermediate documents to avoid confusing search robots and negatively affecting site perception. Alternatively, you can redirect using .htaccess if your site is hosted on an Apache server.

Moreover, you must configure internal linking to all elements, such as JavaScript, CSS, and images, replacing URLs from HTTP to HTTPS. It is crucial to ensure the proper functioning of external scripts and images over HTTPS. Inform search engines about your site's transition to HTTPS by updating the file with the directives for the search robot robots.txt and the site map sitemap.xml. Additionally, update your website URL on social networks and traffic tracking systems like Google Analytics. Create a new entry for the HTTPS resource in Google Webmaster Tools so that search engines can index and provide the content of your resource at the new URL.

Monitor the site daily with HTTPS in Google Webmaster Tools and Google Analytics to prevent possible problems with indexing and displaying your site. However, this transition may cause fluctuations in traffic volumes and site positions, since the 301st redirect transmits only 90 to 99% of the link weight. Lastly, the problem can also be solved using PHP code or by following the provided .htaccess file.