A method for manipulating the data traffic related to a target connected to a data communications network whose elements communicate according to the HTTP protocol, comprising the steps that consist in: - passively intercepting, on the part of a traffic manipulation device which comprises a proxy, a first HTTP request that originates from said target, said first HTTP request comprising a first domain associated with a server and a requested resource; - sending, on the part of said manipulation device, a first HTTP response related to said first HTTP request, said first HTTP response comprising redirection instructions, said redirection instructions in turn comprising a second domain; - passively intercepting, on the part of said traffic manipulation device, a DNS query toward a DNS server that originates from said target, said first DNS query comprising a query to resolve said second domain with an IP address; - sending, on the part of said manipulation device, a DNS response related to said DNS query, said first DNS response comprising the resolution of said second domain with the IP address of said proxy; - receiving, on the part of said proxy, a second HTTP request that originates from said target, said second HTTP request comprising said second domain and said requested resource; - sending, on the part of said proxy, a third HTTP request toward said server, said third HTTP request comprising said first domain and said requested resource; - receiving, on the part of said proxy, a second HTTP response originating from said server and related to said third HTTP request, said second HTTP response comprising said requested resource; - modifying, on the part of said proxy, said requested resource; - sending, on the part of said proxy, a third HTTP response to said target, said third HTTP response comprising said modified resource. - passively intercepting, on the part of a traffic manipulation device which comprises a proxy, a first HTTP request that originates from said target, said first HTTP request comprising a first domain associated with a server and a requested resource; - sending, on the part of said manipulation device, a first HTTP response related to said first HTTP request, said first HTTP response comprising redirection instructions, said redirection instructions in turn comprising a second domain; - passively intercepting, on the part of said traffic manipulation device, a DNS query toward a DNS server that originates from said target, said first DNS query comprising a query to resolve said second domain with an IP address; - sending, on the part of said manipulation device, a DNS response related to said DNS query, said first DNS response comprising the resolution of said second domain with the IP address of said proxy; - receiving, on the part of said proxy, a second HTTP request that originates from said target, said second HTTP request comprising said second domain and said requested resource; - sending, on the part of said proxy, a third HTTP request toward said server, said third HTTP request comprising said first domain and said requested resource; - receiving, on the part of said proxy, a second HTTP response originating from said server and related to said third HTTP request, said second HTTP response comprising said requested resource; - modifying, on the part of said proxy, said requested resource; - sending, on the part of said proxy, a third HTTP response to said target, said third HTTP response comprising said modified resource.