A client device for obtaining a data object from a server device, comprising: a transmitter for sending to the server device a request comprising a first codeword and an arbitrary alphanumeric string, wherein the first codeword indicates that the alphanumeric string should be interpreted at the server as a search string; and a receiver for receiving from the server device, in reply to the request, a data object comprising the arbitrary alphanumeric string. A server device for providing a data object to a client device, comprising: a receiver for receiving from the client device a request comprising a first codeword and an arbitrary alphanumeric string; parsing means for parsing the request; detection means for detecting the presence of the first codeword in the request; search means for searching a database comprising data objects to obtain a data object comprising the alphanumeric search string; and a transmitter for transmitting to the client device, in reply to the request, the obtained data object.