// look for "\r\n" paying attention to a special case: "\r\n" could
// have been split by buffer boundary, so check also for \r at the end
// of the last chunk and \n at the beginning of this one
// look for "\r\n" paying attention to a special case: "\r\n" could
// have been split by buffer boundary, so check also for \r at the end
// of the last chunk and \n at the beginning of this one