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http服务中，使用write分段输出文件。设置header总文件长度无用

```php
<?php

declare(strict_types=1);

$http = new Swoole\Http\Server('0.0.0.0', 9595);
$http->on('request', function ($request, $response) {
    $file     = __DIR__ . '/test.apk';
    $filesize = filesize($file);

$response->header('content-description', 'file transfer');
    $response->header('content-type', 'application/octet-stream');
    $response->header('content-disposition', 'attachment; filename=' . basename($file));
    $response->header('content-transfer-encoding', 'binary');
    $response->header('expires', '0');
    $response->header('cache-control', 'must-revalidate, post-check=0, pre-check=0');
    $response->header('pragma', 'public');
    $response->header('content-length', (string) $filesize);
    $response->header('accept-length', (string) $filesize);
    print_r($request);
    $fp   = fopen($file, 'r');
    while (! feof($fp)) {
        $data = fread($fp, 150 * 1024);
        if (! $response->write($data) || ! $data) {
            break;
        }
    }
    fclose($fp);
    $response->end();
});
$http->start();
```
在下载文件的时候，不显示文件总长度为什么@

发布于2年前 · 19 次浏览 · 来自提问

mxwei

```php
<?php

declare(strict_types=1);

$http = new Swoole\Http\Server('0.0.0.0', 9595);
$http->on('request', function ($request, $response) {
    $file     = __DIR__ . '/test.apk';
    $filesize = filesize($file);