send XML string as POST body into WCF endpoint

gistfile1.cs

[OperationContract]
[WebInvoke(Method = "GET", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json,
    UriTemplate = "/proxy/?url={url}")]
String proxy_GET(string url);

[OperationContract]
[WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Bare, 
    RequestFormat = WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Xml,
    UriTemplate = "/proxy/?url={url}")]
XElement proxy_POST(string url, XElement postData);