http ServerRequest data loss?

upload.coffee

app.put '/uploads/:fileid', (request,response) ->

    getCachePath (path) -> #... does a bunch of prep
        stream = fs.createWriteStream path, 
            bufferSize: 1024*1024*4
            encoding: 'binary'
            start: start
            flags: if start != 0 then 'r+' else 'w'
        stream.on 'close', ->
            response.send 202,
                'Access-Control-Allow-Origin' : '*'
        request.pipe stream
        # first chunk of data never gets piped

# as an experiment I tried setting a data handler earlier.
# the following emits a console message that the data is getting received
# so compared to the above, it is getting lost somewhere between

app.put '/uploads/:fileid', (request,response) ->
    
    request.on 'data', (data) ->
        console.log 'received:',data.length
    
    getCachePath (path) -> #... does a bunch of prep
        stream = fs.createWriteStream path, 
            bufferSize: 1024*1024*4
            encoding: 'binary'
            start: start
            flags: if start != 0 then 'r+' else 'w'
        stream.on 'close', ->
            response.send 202,
                'Access-Control-Allow-Origin' : '*'
        request.pipe stream