Abstract: Conditionally combining data from several sources may include retrieving data from several sources in response to a single request and using one or more redirection responses. The request from a client device may include a device identifier, a third-party identifier, a join identifier based, at least in part, on the device identifier, and first data from a first source, such as a first cookie, associated with the received request. A redirection destination may be determined based on configuration data associated with the third-party identifier, such as whether one or more services are selected and/or activated by a publisher of a resource. A redirection response is transmitted to the client device responsive to the received request and includes the redirection destination and the join identifier. The first data from the received request and second data received from the redirection destination may be associated based on the join identifier.

Abstract: Conditionally combining data from several sources may include retrieving data from several sources in response to a single request and using one or more redirection responses. The request from a client device may include a device identifier, a third-party identifier, a join identifier based, at least in part, on the device identifier, and first data from a first source, such as a first cookie, associated with the received request. A redirection destination may be determined based on configuration data associated with the third-party identifier, such as whether one or more services are selected and/or activated by a publisher of a resource. A redirection response is transmitted to the client device responsive to the received request and includes the redirection destination and the join identifier. The first data from the received request and second data received from the redirection destination may be associated based on the join identifier.