node js proxy server

See more:

Javascript

Hi all,
i have a question :

i wrote an application that connected and got data (text, json, xml ...) from a server A(183..) . But some time server A was died .

so i want to set up an program (wrote by node.js) on server B (84....) that cach all of data that getting from server A

example : today i query the server A for url http://xyz.com/1.html
tomorrow server A may be died
so i will query the server B (Node.js) and receive the same result (http://abc.com...)

how can i do ?

thank for help !