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                # Coroutine\Http\Client->download 通過Http下載文件。download與get方法的不同是download收到數據后會寫入到磁盤,而不是在內存中對Http Body進行拼接。因此download僅使用小量內存,就可以完成超大文件的下載。 函數原型: ```php function Coroutine\Http\Client->download(string $path, string $filename, int $offset = 0); ``` - $path URL路徑 - $filename 指定下載內容寫入的文件路徑,會自動寫入到`downloadFile`屬性 - $offset 指定寫入文件的偏移量,此選項可用于支持斷點續傳,可配合Http頭`Range:bytes=$offset-`實現 - $offset為0時若文件已存在,底層會自動清空此文件 - 執行成功返回true - 打開文件失敗或feek失敗返回false ### 使用示例 ```php $host = 'www.swoole.com'; $cli = new \Swoole\Coroutine\Http\Client($host, 443, true); $cli->set(['timeout' => -1]); $cli->setHeaders([ 'Host' => $host, "User-Agent" => 'Chrome/49.0.2587.3', 'Accept' => '*', 'Accept-Encoding' => 'gzip' ]); $cli->download('/static/files/swoole-logo.svg', __DIR__ . '/logo.svg'); ```
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