nginx零拷贝配置与实现

Question

背景： nginx开启零拷贝之后，可以跳过（内核缓冲区->用户态->socket缓冲区）这一个过程，减少用户态到内核态的切换。

配置：nginx

sendfile:on;

问题：在开启了nginx零拷贝后，php生成一个压缩文件后怎么返回给浏览器？告知nginx要下载的是哪个文件，需要配置head信息？

传统下载方式：

static function flushFile($filePath, $type, $fileSize, $name)
{

    $localFile = fopen($filePath, 'r');

    header("Content-Type: " . $type);
    header("Accept-Range: bytes");
    header("Content-Length: " . $fileSize);
    header('Content-Disposition: attachment; filename="'. $name.'"');

    $buffer = 1024;
    while (!feof($localFile)) {
        echo fread($localFile, $buffer);
    }
    fclose($localFile);

}

网上有看到一个用例是配置X-Accel-Redirect属性如：
static function flushFile($filePath, $type, $fileSize, $name)

{
    header("Content-Type: " . $type);
    header("Accept-Range: bytes");
    header("Content-Length: " . $fileSize);
    header('Content-Disposition: attachment; filename="'. $name.'"');

    header('X-Accel-Redirect: '. $filePath);

}

但是这样浏览器会报错，响应无效，官方文档也找不到X-Accel-Redirect的相关信息

Answer 1

已解决
官方文档地址 https://www.nginx.com/resourc...

Answer 2

public function download($filename, $filePath){
        // 校验通过后        
        header('Content-Type: application/octet-stream');           

        ob_start();
        readfile($filePath);
        $data = ob_get_contents();
        ob_end_clean();
        header('Accept-Length: '.strlen($data));
        $ua = $_SERVER["HTTP_USER_AGENT"];  // 处理不同浏览器的兼容性
        if (preg_match("/MSIE/", $ua) || preg_match("/rv:/", $ua)) {
            $encoded_filename = rawurlencode($filename);
            header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
        } else if (preg_match("/Firefox/", $ua)) {
            header("Content-Disposition: attachment; filename*=\"utf8''" . $filename . '"');
        } else {
            header('Content-Disposition: attachment; filename="' . $filename . '"');
        }
        echo $data;
    }