I am using node.js on my rackspace server to serve my various applications. (Using node-http-proxy).
However, i would like to start a wordpress blog. The only way to serve the blog is via apache (or nginx).
Is there a way to server my wordpress blog from a node.js application itself?
You need some server running to execute the PHP. Node is JavaScript.
Whether that's apache, or nginx/php-fpm or just php-fpm, you need something to actually run the wordpress code, then use the same proxying system you are using now.