Call to getParameters is crushing downstream use #2

When the jsonp filter tries to determine whether it should execute or not, it 
calls request.getParameterMap(). This reads from the input stream. Later in my 
servlet code, I get a handle to the input stream in order to read body content. 
At this point, the stream has been read and I get no content from the input 
stream.

Are there workarounds that will allow us to reset the input stream after the 
filter reads from it?