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Editorial Team
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Asked: 2026-05-15T13:29:01+00:00

.NET 4 broke ValidateRequest=false for some reason. The solution is — just put <httpRuntime

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.NET 4 broke ValidateRequest=“false” for some reason.

The solution is — just put <httpRuntime requestValidationMode="2.0" /> into your web.config file.

The problem with that solution is that it breaks support for .NET 2.0!

IIS refuses to accept unknown attributes in web.config. Also I don’t like the all or nothing nature of this.

Can I set requestValidationMode (or in some other way disable request validation) for a single page that needs it? Without breaking backwards compatibility of web.config with 2.0?

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  1. Editorial Team

    OK, looks like this can’t be done and I can just escape the data easily, but I think this was a legitimate question — at least to make a note here that this can’t be done.

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