Creating a http-proxy that can modify the http response before sending it to the client

Question

I'm using wget to grab a something from the web, but I don't want to follow a portion of the page. I thought I could set up a proxy that would remove the parts of the webpage I didn't want to be processed, before returning it to wget but I'm not sure how I would accomplish that.

Is there a proxy that lets me easily modify the http response in python or node.js?