Question

我使用以下代码下载文件

#_*_ coding:utf-8 _*_
import re
'''
refer to the code of Gábor Erds below
'''

N = "wherewhere"
cnt = 0
result = ''
countN = 0
showresult = []

for i in range(1,len(N)+1):
    if cnt <= len(re.findall(N[0:i],N)):
        cnt = len(re.findall(N[0:i],N))
        result = re.findall(N[0:i],N)[0]
        countN = len(N)/len(result)
for i in range(0,countN):
    showresult.append(result)
print showresult

它将使用faullt下载文件，因为我没有解压缩文件。我将评论下面的一行

$full_path_file=ctrl_options::GetSystemOption('sentora_root') . "etc/tmp/". basename($backup);

$file_for_user=basename($backup);
header('Content-Description: File Transfer');
header("Content-type: application/octet-stream");    
header('Content-Disposition: attachment; filename="'.$file_for_user.'"');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($full_path_file));
readfile($full_path_file);

它工作正常。让我知道标题的clearcut功能（＆＃39; Content-Length：＆＃39; .cilesize（$ full_path_file））;？

Answer 1

我想，在下载任何文件之前，浏览器应该知道您正在下载的文件大小。浏览器/下载管理器可以管理下载，部分下载数据等

php标题中Content-Length的用途是什么？

1 个答案: