Large File Upload blocking

["sirius black" <padfootpost@xxxxxxxxx>]

I'm trying to prevent my users from uploding files larger than 500MB.  I know that I can use LimitPayloadBody and ErrorDocument 413 to redirect the users to a page telling them their file is too large.  But then it seems like apache still has to read in the entire file before it returns the user.  Even with a simple html file like this: 

<FORM ENCTYPE='multipart/form-data' method='POST' action='http://localhost'>

<INPUT TYPE='file' NAME='mptest'>

<INPUT TYPE='submit' VALUE='upload'>

</FORM>


it takes a long time for a 1.9GB file to upload.

Is there a way to prevent Apache form continuing to read the socket?  If I try to break before that, I get an "Ivalid Response From the Server" or something like that response.

Thanks