This should get you the total you want:
req.on( 'response', function ( data ) {
console.log( data.headers[ 'content-length' ] );
} );
I get a content length of 9404541
This should get you the total you want:
req.on( 'response', function ( data ) {
console.log( data.headers[ 'content-length' ] );
} );
I get a content length of 9404541