Three years ago I wrote a tutorial about security headers in ASP.NET MVC. A lot happened since then and ASP.NET Core is the framework everyone should be on eventually. Time for an updated version for Core! This post is part of the series ASP.NET Security.

I'll try to recap the different security headers in the post. If you are interested in more context, check out the original post. I'll go through each header like in the last post, but let's start by discussing how to modify headers in ASP.NET Core. Like ASP.NET (MVC) there are multiple ways of modifying headers. This post introduces two different ways:

  1. Through middleware
  2. In web.config

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The Security Headers Documentation for ASP.NET Core
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