Ruby CGI 在向 Opera 发送数据时无法继续下载过程

Question

我写了一个小 Ruby CGI 脚本 - 让我们调用 downloader.rb - 来帮助我的朋友轻松地从文件托管服务下载文件。我的脚本如下所示：

#!/usr/bin/ruby

require "cgi"

cgi=CGI.new(:accept_charset => "UTF-8")
file_id=cgi["id"] #get the file id from the GET request variable
url="http://www.yetanotherfilehost.com/file/#{file_id}"

range=ENV["HTTP_RANGE"]==nil ? "" : "-r #{ENV["HTTP_RANGE"].split("=")[1]}" #get the range HTTP request header which in fact is passed in the request header, but can be accessed through an environment variable called HTTP_RANGE

header=%x{curl #{range} -s -b ./cookie.txt "#{url}" -L -I}.force_encoding("utf-8").encode("utf-8").split("\r\n").last(7).join("\r\n")
#I simply call curl with option -I to dump the response headers and -L
# to follow redirection which occurs in this case, and then keeping only 
# the last 7 lines of headers, to send them back later to my users, 
# thus emulating a download process. Response headers looks like follows:

=begin

HTTP/1.1 302 Found
Date: Sat, 20 Jun 2015 06:25:19 GMT
Server: Apache
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Set-Cookie: auth=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX; expires=Sun, 20-Dec-2015 07:25:19 GMT; path=/; domain=.yetanotherfilehost.com
Location: http://server007.yetanotherfilehost.com/get/p/33fi3trctwtl/c50fc7dbb8824cfe/gandahar.avi
Connection: close
Content-Type: text/html; charset=utf-8

HTTP/1.1 200 OK
Server: nginx
Date: Sat, 20 Jun 2015 06:25:20 GMT
*Content-Type: application/force-download
*Content-Length: 1468299264
*Last-Modified: Fri, 12 Sep 2014 11:43:06 GMT
*Connection: close
*Content-Disposition: attachment; filename="gandahar.avi"
*ETag: "5412dc4a-57847800"
*Accept-Ranges: bytes

=end

puts header # sending back the last 7 lines of headers marked with asterisks, to my users.
puts
system "curl #{range} -s -b ./cookie.txt \"#{ff_url}\" -L -o -" #download the file and writing the content to stdout

他们可以使用我的脚本，例如通过在他们的浏览器中粘贴 link 来调用它： http://www.example.com/cgi-bin/downloader.rb?id=33fi3trctwtl 然后开始下载，感谢支持的 cookie 文件。

我的问题是，当我使用 cURL 或 Wget 下载文件时，我可以在按 Ctrl+C 中断下载后继续下载（例如 "curl -C - http://www.example.com/cgi-bin/downloader.rb?id=33fi3trctwtl" 或 "wget -c http://www.example.com/cgi-bin/downloader.rb?id=33fi3trctwtl" ) 两个程序都可以继续下载过程，并且根据它们的 md5 总和，文件是完整的。但是，当我使用 Opera 浏览器下载文件并停止下载过程时，我无法继续下载。我该怎么做才能让它与 Opera 一起工作，当然还有其他能够继续中断下载的浏览器？

Answer 1

好的，问题解决了。我不得不在第一个名为 "Status: 206 Partial Content" 的地方添加一个额外的 header 行，但只有当范围请求 header 不为空时才行。

Ruby CGI 在向 Opera 发送数据时无法继续下载过程

Ruby CGI is unable to continue the downloading process when sending data to Opera

ruby

curl

header

cgi

download