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HttpCachePolicy.SetNoTransforms Method

Sets the Cache-Control: no-transform HTTP header.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public void SetNoTransforms()

The Cache-Control: no-transform HTTP header instructs network caching applications not to modify the document.

The Cache-Control: no-transform HTTP header prevents downstream proxy servers from changing any header values specified by the Content-Encoding, Content-Range, or Content-Type headers (this includes the entity body). For example, it prevents proxies from converting GIF images to PNG.

As with other restrictions on caching, once SetNoTransforms is called, the Cache-Control: no-transform HTTP header cannot be disabled through the HttpCachePolicy interface.

SetNoTransforms is introduced in the .NET Framework version 3.5. For more information, see .NET Framework Versions and Dependencies.

The following code example demonstrates how to send the Cache-Control: no-transform directive with the current response.

Response.Cache.SetNoTransforms();
    

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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