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This category of responses is the most problematic and important to study. Status codes 400-499 indicate problems that have arisen on the initiative of the client. These problems can range from client-initiated requests to an incorrect node name, request timeout, uncontrolled request, malicious request, and others.

The indicator allows advertisers to assess how attractive their messages are to the target audience. Measuring CTR allows marketers not only to analyze which ads demonstrate the highest click-through rate, but also to understand the behavior of their potential customers.

These standard codes are necessary to indicate to the user what action must be taken to successfully complete the request. 3xx codes are intended to redirect the client and are not HTTP server errors.

HTTP status (response) code or, as it is often called, “status code” is a small three-digit number that conveys information about how the user’s request was processed by the server. It helps to determine whether the server has successfully processed the request or if there were any problems.

Site traffic is the number of visits to a web resource, the effectiveness of which must be analyzed once in a selected period. Most often, this is done once a month, six months or a year. The indicator is monitored in order to understand how interesting the product is to potential customers, as well as to evaluate the convenience and relevance of the web resource itself and the content on it.