A method of and module for masking application processing applied to a request for access to a server by a client workstation connected via successive proxy servers. The application of a first proxy server, is executed, the address of the client workstation is inserted into a specific data field of the access request message header, without calling for any IP spoofing function and the access request message for execution of successive application processing is sent to successive proxy servers. After execution of its application processing by a last proxy server and transmitting of the access request message to the server, the access request message is intercepted at a masking module, the specific field from the header is eliminated to mask the application processing, and a masked access request message having as its source IP address the address of the client workstation and as its destination IP address the address of the server, is constructed and the masked access request message is sent from the masking module to the server.
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