A method for redirecting client requests, by an intermediary device, to a horizontally deployed Wide Area Network, WAN, optimization device providing service to the client request, the method comprising: a) receiving via a first transport layer connection, by an intermediary device deployed between a plurality of clients and one or more servers, a first request from a first client of the plurality of clients to access a first server of the one or more servers, the first request modified by a first Wide Area Network, WAN, optimization device deployed between the client and the intermediary device to include information in a first option field of a transport layer header of the first request for processing by a second WAN optimization device; b) determining, by the intermediary device, responsive to a redirection policy, to send the first request to the second WAN optimization device instead of the server, the second WAN optimization device deployed horizontally to the intermediary device, the horizontally deployed second WAN optimization device communicating with the intermediary device via a first network path that is different from and not a part of a second network path over which network traffic between the plurality of clients and one or more servers traverses the intermediary device, wherein determining to send the first request to the second WAN optimization device instead of the server comprises identifying a presence of the information in the first option field of the first request or comparing a source IP address of the first client to a predetermined IP address; c) establishing, by the intermediary device, a second transport layer connection with the second WAN optimization device; and d) transmitting, by the intermediary device, the first request to the second WAN optimization device via the second transport layer connection; e) receiving, by the intermediary device from the second WAN optimization device, the first request processed by the second WAN optimization device to form a second request; f) determining, by the intermediary device, to transmit the second request to the server identified by the first request responsive to identifying that the second request is received after processing of the first request by the second WAN optimization device; and g) transmitting, by the intermediary device, the second request to the server. a) receiving via a first transport layer connection, by an intermediary device deployed between a plurality of clients and one or more servers, a first request from a first client of the plurality of clients to access a first server of the one or more servers, the first request modified by a first Wide Area Network, WAN, optimization device deployed between the client and the intermediary device to include information in a first option field of a transport layer header of the first request for processing by a second WAN optimization device; b) determining, by the intermediary device, responsive to a redirection policy, to send the first request to the second WAN optimization device instead of the server, the second WAN optimization device deployed horizontally to the intermediary device, the horizontally deployed second WAN optimization device communicating with the intermediary device via a first network path that is different from and not a part of a second network path over which network traffic between the plurality of clients and one or more servers traverses the intermediary device, wherein determining to send the first request to the second WAN optimization device instead of the server comprises identifying a presence of the information in the first option field of the first request or comparing a source IP address of the first client to a predetermined IP address; c) establishing, by the intermediary device, a second transport layer connection with the second WAN optimization device; and d) transmitting, by the intermediary device, the first request to the second WAN optimization device via the second transport layer connection; e) receiving, by the intermediary device from the second WAN optimization device, the first request processed by the second WAN optimization device to form a second request; f) determining, by the intermediary device, to transmit the second request to the server identified by the first request responsive to identifying that the second request is received after processing of the first request by the second WAN optimization device; and g) transmitting, by the intermediary device, the second request to the server.