Top 20 NuGet anti Packages

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Cleans HTML from constructs that can be used for cross site scripting (XSS)
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Rule based HTML sanitizer using a white list. Documentation at: https://github.com/Vereyon/HtmlRuleSanitizer
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ProceXSS is a Asp.NET Http module for preventing xss attacks.
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You can do a lot of http requests through different proxies.
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A package to secure all controllers actions in your application by default by disallowing anonymous access, and requiring each HttpPost action to be passed an anti-forgery token. Anonymous access to a controller action needs to be explicitly set by use of an attribute.