title: Missing Javascript ".map" file for Underscore.js when loading ASP.NET web page
body: <p>I have a web page that is part of a ASP.NET web site running on Azure.  It's run fine for quite a while now.  Out of the blue, I am suddenly having a problem with the browser trying to download a ".map" for Underscore.js.  I did some reading and apparently JQuery creates ".map" files as debugging aids for Javascript source files (".js").  However, if I look at the Scripts directory for my web site I see that this only happens for some JQuery source files and not all and I am not sure what the pattern is.</p>
  
  <p>However, why would the browser be trying to load a "map" file for Underscore.js which is not part of JQuery?  Also, why would this suddenly start happening?  I added Underscore.js to the web page quite some time ago and never had this problem before.  </p>
  
  <p>The exact error I get when I look in the Chrome Debugger Console tab is:</p>
  
  <p>GET <a href="http://myazureapp.cloudapp.net/Scripts/underscore-min.map" rel="noreferrer">http://myazureapp.cloudapp.net/Scripts/underscore-min.map</a> 404 (Not Found) Scripts/underscore-min.map:1</p>