A page request is received from a browser. A page script corresponding to the page request is allocated from a plurality of page scripts corresponding to the page request. The page script is transmitted to the browser for generation of a script execution parameter by execution of the page script by the browser. A page verification request is received from the browser, where the page verification request includes the script execution parameter. Whether a page verification request is expired is determined, where if the page verification request is expired, generating error prompt information indicating a page expiration. If the page verification request is not expired, whether the script execution parameter is valid, is determined. If the script execution parameter is valid, the validity is indicated, otherwise the page request is rejected.