Design And Implementation Of A WEB Secure Gateway Proxy Supported AJAX

With the WEB 2.0 proposed,AJAX has becom e a critical request way for client.Because AJAX using asynchronous way to requ est and load page,the whole page need not to reload and the browser will not wait unti the end of the load.by this way the load speed of page has a very obvious im provement.However,because AJAX request is ach ieved by execute JavaScript code,the request url can not recognize in the page code.it bing difficulty to the proxy process.Besides,although secure web geteway has virus scan function whic h will offer a more saf e network environment to users,the traditional virus scan way is f ile scan,this will increase the handling time.especially if the user request a big f ile,the weak point may result in the connection time out,user will receive the error message of time out.To achieve proxy the AJAX request,this paper propose a way which is based on JavaScript ptototype to rewr ite the AJAX request.XMLHttpReque st object is the core in AJAX,the final request url is one of the paraments in the open m ethod of XMLHttpRequest.Rewirte the open m ethod by using XMLHttpRequest prototype,modify the url in the open m ethod.This is different from the traditional proxy m ethod,the process of proxy is in the execution of code in browse r.Through the experiment,the result show that this way has implemented the change of AJAX request url and the proxy function.To solve the problem of file virus scan speed is too slow,this paper propose a way which using packet scan instead of file scan.By this way the process of data scan and receive could excute p arallel.The experiment result prove that the s peed of security detection have a obvious improvement.At the end of this paper,designed and implemented a web secure gateway proxy supported AJAX by combining with the above two kinds of echnology research,including the design of system function module and the working process.By the experiment prove that ajax proxy and secure dectect basedo n packet scan in system reached the expected purpose on function and performance.