web.config

<?xml version="1.0"?>
<!--
  有关如何配置 ASP.NET 应用程序的详细信息，请访问
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0"/>
  </system.web>
  <system.webServer>
    <defaultDocument>
      <files>
        <clear />
        <add value="default.aspx" />
      </files>
    </defaultDocument>
    <security>
      <requestFiltering>
        <fileExtensions>
          <add fileExtension=".json" allowed="true" />          
          <add fileExtension=".geojson" allowed="true" />
          <add fileExtension=".kml" allowed="true" />
          <add fileExtension=".gpx" allowed="true" />
        </fileExtensions>
      </requestFiltering>
    </security>
    <staticContent>
      <mimeMap fileExtension=".geojson" mimeType="text/geojson" />
      <mimeMap fileExtension=".kml" mimeType="application/vnd.google-earth.kml+xml" />
      <mimeMap fileExtension=".gpx" mimeType="application/gpx" />
    </staticContent>
  </system.webServer>
</configuration>