Capturing raw data in Web Api controller

I needed to capture raw POSTed data in a Web API controller endpoint. This is how it's done:

using (var contentStream = await this.Request.Content.ReadAsStreamAsync())
            {
                contentStream.Seek(0, SeekOrigin.Begin);
                using (var sr = new StreamReader(contentStream))
                {
                    string rawData = sr.ReadToEnd();
                }
            }