title: Serving files from static url with Go / Negroni / Gorilla Mux
body: <p>So I am new to Go and trying it out to build a simple web server.  One part I am having trouble with is that I want to serve static files with dynamic static urls (to enable long caching by the browser).  For example, I might have this url:</p>
  
  <p><code>/static/876dsf5g87s6df5gs876df5g/application.js</code></p>
  
  <p>But I want to serve the file located at:</p>
  
  <p><code>/build/application.js</code></p>
  
  <p>How would I go about this with Go / Negroni / Gorilla Mux?</p>