range协议用途:一般是用在断点续传的时候,但是实际的用户很大,例如你的web server需要输出一个大文件,那么用range可以分段输出,缓解压力。同时在提供音乐视频等服务时可以缓冲下载,如果用户中途关闭,可以节约网络带宽。
<"mp3") { $mimeType = "audio/mpeg"; } else if ($extension == "ogg") { $mimeType = "audio/ogg"; } if (! file_exists ( $location )) { header ( "HTTP/1.1 404 Not Found" ); return; } $size = filesize ( $location ); $time = date ( 'r', filemtime ( $location ) ); $fm = @fopen ( $location, 'rb' ); if (! $fm) { header ( "HTTP/1.1 505 Internal server error" ); return; } $begin = 0; $end = $size - 1; if (isset ( $_SERVER ['HTTP_RANGE'] )) { if (preg_match ( '/bytes=\h*(\d+)-(\d*)[\D.*]"Content-Type: $mimeType" ); header ( 'Cache-Control: public, must-revalidate, max-age=0' ); header ( 'Pragma: no-cache' ); header ( 'Accept-Ranges: bytes' ); header ( 'Content-Length:' . (($end - $begin) + 1) ); if (isset ( $_SERVER ['HTTP_RANGE'] )) { header ( "Content-Range: bytes $begin-$end/$size" ); } header ( "Content-Disposition: inline; filename=$filename" ); header ( "Content-Transfer-Encoding: binary" ); header ( "Last-Modified: $time" ); $cur = $begin; // 定位指针 fseek ( $fm, $begin, 0 ); while ( ! feof ( $fm ) && $cur <= $end && (connection_status () == 0) ) { print fread ( $fm, min ( 1024 * 16, ($end - $cur) + 1 ) ); $cur += 1024 * 16; }
range协议官方文档:http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
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