|<a id="ref-imessagebody"></a>IMessageBody|As<T\>(preserveContent: bool = false): Where T: string, JObject, JToken, JArray, XNode, XElement, XDocument<br /><br /> The `context.Request.Body.As<T>` and `context.Response.Body.As<T>` methods are used to read a request and response message bodies in a specified type `T`. By default the method uses the original message body stream and renders it unavailable after it returns. To avoid that by having the method operate on a copy of the body stream, set the `preserveContent` parameter to `true`. Go [here](api-management-transformation-policies.md#SetBody) to see an example.|