Patent ID: 8990291
Filing Date: 2015-03-24
Classification: H04L

Abstract:
1. A server-client system comprising: a server configured to: a client terminal communicable with the server via a network and including a browser configured to execute JavaScript by dynamically embedding a single-pixel image file that is dynamically added with a random parameter to a source of a <img> tag element in a <div> tag element, wherein the random parameter includes current time data acquired in the client terminal, wherein the browser makes a request for the single-pixel image file to the server by a GET command responsive to an input event generated from the client terminal, wherein the server reads the requested single-pixel image file from the Web site, transfers the read single-pixel image file in HTML to the client terminal, and concurrently records a log of the access made from the client terminal, wherein the log to be recorded at the server includes the random parameter added to the single-pixel image file in the request for the single-pixel image file, in addition to information recordable by the Web beacon technology, and wherein the random parameter further includes information to reconstruct input events associated with the access made at the client terminal and guarantees causality of the input events, the information including a key-down in which a character string is input from an input device.