MVC4 Bundling: where the URL for bundle is held

Question

When the bundle is registered in MVC4, what is responsible for "intercepting" incoming http requests for /bundles/someBundle?v=1hDzBpmYJm4Iu-OjRN1YqS1WeNThVl0kStLJGP8WCr41? also since hash for each bundle is calculated only once (at a first request), where is that actually held, - and is it possible to return 404 if an incoming hash does not match

Answer 1

what is responsible for "intercepting" incoming http requests for ~/bundles/someBundle

There are no incoming requests to ~/bundles/someBundle. It's the server side helper that you are using (Scripts.Render) that on the server (within the same HTTP requests) interprets this value and spits the correct url in the resulting HTML.

also since hash for each bundle is calculated only once (at a first request), where is that actually held,

The actual bundle contents is stored in the server side cache : HttpContext.Cache. The actual hash represents a SHA256 hash on this content that is calculated every time you use the Scripts.Render helper.

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UPDATE:

It's the System.Web.Optimization.BundleModule that is auto-registered when you reference the System.Web.Optimization assembly that is responsible for intercepting requests to urls like /bundles/someBundle?v=1hDzBpmYJm4Iu-OjRN1YqS1WeNThVl0kStLJGP8WCr41 and returning the actual contents.