Abstract: Determining a uniform user identifier for a visiting user is disclosed, including: generating a plurality of access sets based at least in part on the network address identifier associated with a plurality of access requests submitted by one or more visiting users, and a plurality of header field elements associated with the plurality of access requests, wherein each of the plurality of access requests includes a preliminary user identifier, the network address identifier, and the plurality of header field elements, and wherein an access set includes the network address identifier and at least some of the plurality of header field elements; determining information loss rates corresponding to respective ones of at least a subset of the plurality of access sets; and selecting an access set from the plurality of access sets based at least in part on the respective information loss rate to use to determine a uniform user identifier corresponding to a visiting user of the plurality of visiting users.

Abstract: Determining a uniform user identifier for a visiting user is disclosed, including: generating a plurality of access sets based at least in part on the network address identifier associated with a plurality of access requests submitted by one or more visiting users, and a plurality of header field elements associated with the plurality of access requests, wherein each of the plurality of access requests includes a preliminary user identifier, the network address identifier, and the plurality of header field elements, and wherein an access set includes the network address identifier and at least some of the plurality of header field elements; determining information loss rates corresponding to respective ones of at least a subset of the plurality of access sets; and selecting an access set from the plurality of access sets based at least in part on the respective information loss rate to use to determine a uniform user identifier corresponding to a visiting user of the plurality of visiting users.