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You can set an expiry timestamp on API calls to prevent replay attacks over non-secure channels, such as HTTP. The server tracks the expiry timestamp you have specified and rejects all the subsequent API requests that come in after this validity period. To enable this feature, add the following parameters to the API request: signatureVersion=3: If the signatureVersion parameter is missing or is not equal to 3, the expires parameter is ignored in the API request. expires=YYYY-MM-DDThh:mm:ssZ: Specifies the date and time at which the signature included in the request is expired. The timestamp is expressed in the YYYY-MM-DDThh:mm:ssZ format, as specified in the ISO 8601 standard. For example: expires=2011-10-10T12:00:00+0530 A sample API request with expiration is given below: http://<IPAddress>:8080/client/api?command=listZones&signatureVersion=3&expires=2011-10-10T12:00:00+0530&apiKey=miVr6X7u6bN_sdahOBpjNejPgEsT35eXq-jB8CG20YI3yaxXcgpyuaIRmFI_EJTVwZ0nUkkJbPmY3y2bciKwFQ&signature=Lxx1DM40AjcXU%2FcaiK8RAP0O1hU%3D