Canonical address of page

Often referred to as the "canonical URL," is the preferred URL that webmasters designate for a specific piece of content. This is particularly important in the context of search engine optimization (SEO) to prevent issues related to duplicate content.
Another definition associated with the canonical address is normalization. It is also deduplication.
Normalization is the process by which you choose a canonical URL that will represent your page in search results, among all possible options.
When do duplicates appear?:

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In this article, I will describe in detail how I solved the problem of server response delays to client requests. I will describe the operation of the ERR_HTTP2_PING_FAILED error and what steps I took to identify the problem.