asp.net mvc - Routing static assets -

i have folder structure organize assets serve don't want reflected in urls have. example, have

• assets
• • css
• • • bootstrap
• • • less_generated
• • • general
• • js
• • • bootstrap
• • • coffee_script_generated
• • • typescript_generated
• • • general

the folder structure concern me, developer, not resource address. /assets/filename.css filename.css in of listed folders may contain css files, , serve first 1 found. , equivalent .js files.

i can't find way route in mvc. routes route controller, , i'd route file resource instead, , writing controller serve static resources seems wrong, behaviour surrounding cache control headers have manually. how can accomplish this?