How to access the current HttpRequestMessage object globally?

Question

I have a method which creates an HttpResponseMessage containing an Error object which will be returned based on the current request media type formatter.

Currently, I have hardcoded the XmlMediaTypeFormatter but I'd like to be able to find the current request MediaTypeFormatter at runtime but I don't have access to the current request object since my below code exists on a separate class library.

private HttpResponseMessage Create(HttpStatusCode statusCode, string errorCode, string errorMessage)
{
    var result = new HttpResponseMessage(statusCode)
        {
            Content = new ObjectContent<Error>(new Error()
            {
                Code = errorCode,
                Message = errorMessage
            }, new XmlMediaTypeFormatter())
        };
    return result;
}

How to access the current HttpRequestMessage object globally? something like HttpContext.Current.Request

If impossible, how to implement the above method so that it knows which formatter it should be using for the current request?

Answer 1

It's not impossible as I have just recently found out. It's actually added into the Items property of the current HttpContext (if there is one) =[

HttpRequestMessage httpRequestMessage = HttpContext.Current.Items["MS_HttpRequestMessage"] as HttpRequestMessage

Edit:

This is as of WebAPI v2 .. I cannot be sure of previous versions.