To capture SOAP request/response, you can implement IHttpModule and grab the input stream as it's coming in using the below code:
public class LogModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.BeginRequest += this.OnBegin;
}
private void OnBegin(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
HttpContext context = app.Context;
byte[] buffer = new byte[context.Request.InputStream.Length];
context.Request.InputStream.Read(buffer, 0, buffer.Length);
context.Request.InputStream.Position = 0;
string soapMessage = Encoding.ASCII.GetString(buffer);
}
public void Dispose()
{
throw new NotImplementedException();
}
}