readfs.js

var fs = require( 'fs' ),

    // size in bytes
    CHUNK_SIZE = 50,

    file = fs.open( 'file', 'r', '0666', function( err, fd )
    {
        if ( err )
        {
            console.log( err );
            return;
        }

        doRead( fd, function()
        {
            console.log( 'File has been read.' );
        });
    });


function doRead( fd, callback )
{
    var data = new Buffer( CHUNK_SIZE );

    fs.read( fd, data, 0, CHUNK_SIZE, null, function( err, bytesRead )
    {
        if ( err )
        {
            // do something
        }

        // your HTTP stuff here. Data is in the 'data' buffer
        console.log( data.toString().substr( 0, bytesRead ) );

        // recursively read
        if ( bytesRead > 0 )
        {
            doRead( fd, callback );
        }
        else
        {
            callback();
        }
    });
}