public function body($body, $contentType = null)
    {
        $this->message->setBody($body, $contentType);
        return $this;
    }
public function body($body, $contentType = null)
    {
        $this->message->setBody($body, $contentType);
        return $this;
    }
public function body ( $ body , $ contentType = null ) { $ this -> message -> setBody ( $ body , $ contentType ) ; return $ this ; }
set message body

@param string $body
@param string $contentType
@return $this
set message body