HTTP Modules versus ASP.NET MVC Action Filters

ASP.NET MVC has action filters, while ASP.NET has HTTP modules. Inside their respective processing pipelines, these abstractions serve similar purposes, and I've heard the following question a few times:

When should I write an HTTP module and when should I write an action filter?

If you are creating an MVC application then I'll almost always recommend going with an action filter instead of an HTTP module. This is my recommendation even if the functionality you are creating is generic enough to work from inside a module (in other words, it doesn't depend on MVC specific pipeline stages, like the pre and post processing of action invocation). Filters are closely aligned with the MVC infrastructure and vocabulary, and filters are the first thing someone will look for when they want to see how you've implemented cross-cutting functionality in MVC.

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