src/Leevel/Http/Response.php
public function appendContent(string $content = null): IResponse
    {
        if ($this->checkFlowControl()) {
            return $this;
        }

        $this->content = $this->getContent().$content;

        return $this;
    }
public function appendContent(string $content = null): IResponse
    {
        if ($this->checkFlowControl()) {
            return $this;
        }

        $this->content = $this->getContent().$content;

        return $this;
    }
附加内容.

@param string $content

@return $this