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X-aspnetmvc-version Access

curl -I https://example.com | grep -i X-AspNetMvc Expected output: (none).

In the client-server web model, HTTP headers convey metadata about requests and responses. Most production web applications strive to minimize revealing internal infrastructure details. However, default configurations of ASP.NET MVC (versions 3 through 5) implicitly add the X-AspNetMvc-Version header to every HTTP response. This value corresponds directly to the version of the System.Web.Mvc assembly used. x-aspnetmvc-version

<system.webServer> <httpProtocol> <customHeaders> <remove name="X-AspNetMvc-Version" /> </customHeaders> </httpProtocol> </system.webServer> (Note: Method 3 does not always work for MVC-added headers; methods 1 or 2 are preferred.) After removal, a security assessment can confirm absence: curl -I https://example

Abstract: The X-AspNetMvc-Version HTTP header is a custom response header automatically injected by ASP.NET MVC frameworks. While intended to aid debugging and runtime environment identification, this header constitutes a form of information disclosure that can aid malicious actors in reconnaissance. This paper examines the header’s origin, technical function, associated security risks, and industry-standard mitigation techniques. However, default configurations of ASP

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