Where is AutofacRequestLifetimeHttpModule registered?

I am a newbie and trying to read the code. Got this question:

I didn't see anywhere to register AutofacRequestLifetimeHttpModule either in the code, config or attribute.

Can somebody help me point out how AutofacRequestLifetimeHttpModule is registered and Init is executed?

Thanks,

It's registered automatically by Autofac DLL. You can download its source code here

I only saw Autofac registered  it's own type RequestLifetimeHttpModule.

Still didn't find out how Nop's type AutofacRequestLifetimeHttpModule got registered.

Thanks

You're absolutely right. AutofacRequestLifetimeHttpModule is nopCommerce's class. Actually it's not registered as IHttpModule and used by ContainerManager for getting ILifetimeScope instance.