title: Intercept and use local files in http requests
body: <p>I'm trying to find a tool that will allow non-programmers to test files on a live server.</p>
  
  <p>For example, they could modify an image on their computer, reload a webpage, then see the results of their work immediately.</p>
  
  <p>I've tried finding a tool for this, because it seems obvious enough that someone must've thought of it, but a lot of software I see doesn't quite fit. A tool called Fiddler does this (they call it autoresponding) but it's Windows-only. I could change the hosts file to redirect to a local instance of nginx or something, but that seems difficult to maintain when all I really want is a simple tool that will something like this...</p>
  
  <p><a href="http://someserver.com/css/" rel="noreferrer">http://someserver.com/css/</a>(.*) -> /home/user/localcss/$1</p>
  
  <p>Does anybody have any recommendations?</p>
  
  <p><strong>Edit</strong>: Redirect clarification</p>