Cannot display .svg files in Visual Studio 2012 (IIS Express)

Question

Im trying to display .svg files in my web application using Visual Studio 2012, IIS Express v8.0 and ASP .NET Web Forms.

Things i already tried:

1. Adding .svg extension to web.config

<staticContent>
  <remove fileExtension=".svg" />
  <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
</staticContent>

2. Adding .svg extension to C:\Users\UserName\Documents\IISExpress\config\applicationhost.config

<staticContent lockAttributes="isDocFooterFileName">
  ...
  <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
  ...

3. Copy the URL of the image to the browser, and it's displaying fine.

4. Publish the site under IIS, and it's displaying fine. Also, we have a developer using Visual Studio 2013 and it's displaying fine using IIS Express v8.5.

Im adding the .svg as icons, using a span element with a class that has as background with url of the file, so i can't use this solution: SVG files in VS2012

This is the style of class added to the span:

background: transparent url(images/svg/reports.svg) no-repeat scroll 0px 0px;

What's happening?

Answer 1

Based con @user1429080 suggestion, there's a workaround (altought is not the cleanest way it works):

My workaround for this was to create my own httphandler locally which overwrote the content-type for svg.

public class SvgHandler : IHttpHandler
{

    public bool IsReusable
    {
        get { return false; }
    }

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "image/svg+xml";
        context.Response.BinaryWrite(File.ReadAllBytes(context.Request.PhysicalPath));
        context.Response.End();
    }
}

and in web.config i added:

<httpHandlers>
  <add verb="*" path="*.svg" type="SvgHandler" />
</httpHandlers>

with this solution you don't have to use IIS express, you can just use the regular development server in visual studio 2010

Source: Visual Studio Not Displaying SVG image as background