Method for validating delivery of an item of content to a client terminal (UA), comprising a step of: • reception (S210b), by the client terminal (UA), of a first address, called received address, in response to a request sent (S210a) to an address server (LDNS, DNS) in order to obtain the address of a delivery server (uCDN) for delivering said item of content, the request comprising an item of information in relation to said delivery server; characterized in that it furthermore comprises at least the following steps implemented by the client terminal (UA) : • sending (S2302a) a request to a server (CSP) of the content provider comprising said received address identifying said delivery server (uCDN) in order to receive an item of information in relation to a second address, called authentic address, associated with said delivery server; • reception (S2302b) of said item of information sent by said server (CSP), said item of information corresponding to at least one data field positioned at a value indicating whether said received address is equal to said authentic address; and • determination (S230) of the validity of said received address with respect to said authentic address on the basis of said item of information in relation to the authentic address. comprising a step of: • reception (S210b), by the client terminal (UA), of a first address, called received address, in response to a request sent (S210a) to an address server (LDNS, DNS) in order to obtain the address of a delivery server (uCDN) for delivering said item of content, the request comprising an item of information in relation to said delivery server; • reception (S210b), by the client terminal (UA), of a first address, called received address, in response to a request sent (S210a) to an address server (LDNS, DNS) in order to obtain the address of a delivery server (uCDN) for delivering said item of content, the request comprising an item of information in relation to said delivery server; characterized in that it furthermore comprises at least the following steps implemented by the client terminal (UA) : • sending (S2302a) a request to a server (CSP) of the content provider comprising said received address identifying said delivery server (uCDN) in order to receive an item of information in relation to a second address, called authentic address, associated with said delivery server; • reception (S2302b) of said item of information sent by said server (CSP), said item of information corresponding to at least one data field positioned at a value indicating whether said received address is equal to said authentic address; and • determination (S230) of the validity of said received address with respect to said authentic address on the basis of said item of information in relation to the authentic address. • sending (S2302a) a request to a server (CSP) of the content provider comprising said received address identifying said delivery server (uCDN) in order to receive an item of information in relation to a second address, called authentic address, associated with said delivery server; • reception (S2302b) of said item of information sent by said server (CSP), said item of information corresponding to at least one data field positioned at a value indicating whether said received address is equal to said authentic address; and • determination (S230) of the validity of said received address with respect to said authentic address on the basis of said item of information in relation to the authentic address. <EOS>