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php library php下载类,支持断点续传
This project forked from rt5560/11.filedownload
php library php下载类,支持断点续传
HTTP断点续传原理 Http头 Range、Content-Range() HTTP头中一般断点下载时才用到Range和Content-Range实体头, Range用户请求头中,指定第一个字节的位置和最后一个字节的位置,如(Range:200-300) Content-Range用于响应头 请求下载整个文件: GET /test.rar HTTP/1.1 Connection: close Host: 116.1.219.219 Range: bytes=0-801 //一般请求下载整个文件是bytes=0- 或不用这个头 一般正常回应 HTTP/1.1 200 OK Content-Length: 801 Content-Type: application/octet-stream Content-Range: bytes 0-800/801 //801:文件总大小 断点续传测试方法: 使用linux wget命令去测试下载, wget -c -O file http://xxx 1.先关闭断点续传 $flag = $obj->download($file, $name); fdipzone@ubuntu:~/Downloads$ wget -O test.rar http://demo.fdipzone.com/demo.php --2013-06-30 16:52:44-- http://demo.fdipzone.com/demo.php 正在解析主机 demo.fdipzone.com... 127.0.0.1 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。 已发出 HTTP 请求,正在等待回应... 200 OK 长度: 10445120 (10.0M) [application/octet-stream] 正在保存至: “test.rar” 30% [============================> ] 3,146,580 513K/s 估时 14s ^C fdipzone@ubuntu:~/Downloads$ wget -c -O test.rar http://demo.fdipzone.com/demo.php --2013-06-30 16:52:57-- http://demo.fdipzone.com/demo.php 正在解析主机 demo.fdipzone.com... 127.0.0.1 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。 已发出 HTTP 请求,正在等待回应... 200 OK 长度: 10445120 (10.0M) [application/octet-stream] 正在保存至: “test.rar” 30% [============================> ] 3,146,580 515K/s 估时 14s ^C 可以看到,wget -c不能断点续传 2.开启断点续传 $flag = $obj->download($file, $name, true); fdipzone@ubuntu:~/Downloads$ wget -O test.rar http://demo.fdipzone.com/demo.php --2013-06-30 16:53:19-- http://demo.fdipzone.com/demo.php 正在解析主机 demo.fdipzone.com... 127.0.0.1 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。 已发出 HTTP 请求,正在等待回应... 200 OK 长度: 10445120 (10.0M) [application/octet-stream] 正在保存至: “test.rar” 20% [==================> ] 2,097,720 516K/s 估时 16s ^C fdipzone@ubuntu:~/Downloads$ wget -c -O test.rar http://demo.fdipzone.com/demo.php --2013-06-30 16:53:31-- http://demo.fdipzone.com/demo.php 正在解析主机 demo.fdipzone.com... 127.0.0.1 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。 已发出 HTTP 请求,正在等待回应... 206 Partial Content 长度: 10445121 (10.0M),7822971 (7.5M) 字节剩余 [application/octet-stream] 正在保存至: “test.rar” 100%[++++++++++++++++++++++++=========================================================================>] 10,445,121 543K/s 花时 14s 2013-06-30 16:53:45 (543 KB/s) - 已保存 “test.rar” [10445121/10445121]) 可以看到会从断点的位置(%20)开始下载。
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