[libmicrohttpd] Aborting chunked responses

[Jared Cantwell]

Thanks for a great piece of software-- it has helped me tremendously to 
quickly implement a key feature for us.  I have a question about chunked
 uploads that I was hoping you could help me with.  According to the 
documentation (and my reading of the code), when using 
MHD_ContentReaderCallback to return chunks of data (i.e. in response to a
 GET request), there doesn't seem to be a way to indicate that the 
chunked response failed.  Returning 0 will try again, -1 will assume the
 transfer completed successfully.  Is there a way to indicate to MHD 
that a chunked response failed?  

The reason I ask is that we are 
transferring files on the order of 10s of GBs, and we're getting this 
data from throughout our cluster.  Midway through the transfer, anything
 could happen, and it would be nice to just prematurely close the 
connection to signal failure (instead of assuming the end of the chunked
 data was reached).  Am I missing something in the interface, or is this
 just not currently possible?

Thanks for any help!!
~Jared