如果 url 是重定向，Ruby 如何下载文件？
我正在尝试下载这个网址：
soundcloud.com/stereo-f---/cohete-amigo/download
重定向是这样的：
[ec-media.soundcloud.com/HNIGsuMJlDhy?ff61182e3c2ecefa438cd0210ad0e38569b9775ddc9e06b3c362a686319250ea5c1ae2d33d8d525807641f258e33de3cb0e559c1b591b5 b00fb32d5ef9&AWSAccessKeyId=AKIAJ4IAZE5EOI7PA7VQ&过期=1352919869&签名=OVWD9VdV7ew%2B%2Fs%2BO0YpkKZLGOCw%3D][2]
我试过的是这样的：
Net::HTTP.start("ec-media.soundcloud.com") { |http|
resp = http.get("/HNIGsuMJlDhy?ff61182e3c2ecefa438cd0210ad0e38569b9775ddc9e06b3c362a686319250ea5c1ae2d33d8d525807641f258e33de3cb0e559c1b591b5b00fb32d5ef9&AWSAccessKeyId=AKIAJ4IAZE5EOI7PA7VQ&Expires=1352919869&Signature=OVWD9VdV7ew%2B%2Fs%2BO0YpkKZLGOCw%3D")
open("test.wav", "wb") { |file|
file.write(resp.body)
}
}
puts "Done."
sleep 50
我不明白/不知道任何互联网协议和重定向之类的东西...请给我一个很好的解释或帮助我的脚本使用 ruby 从 soundcloud 下载文件？
thankyou
UPDATE:
我已经尝试过这种方法，但出现错误：
Net::HTTP.start("soundcloud.com") do |http|
resp = http.get("/dubstep-4/kill-paris-tender-love/download")
while resp.code == '301' || resp.code == '302'
# moved permanently or temporarily: try again at the new location.
resp = http.get(URI.parse(resp.header['location']))
# ideally you should also bail if you make too many redirects.
end
# make sure the request was successful.
if resp.code == '200'
open("test.wav", "wb"){ |file| file.write(resp.body) }
else
puts "Error: HTTP #{resp.code}"
end
end
Error:
C:/Program Files (x86)/Ruby/lib/ruby/1.9.1/net/http.rb:1860:in `initialize': undefined method `empty?' for #<URI::HTTP:0x25a9ce8> (NoMethodError)
from C:/Program Files (x86)/Ruby/lib/ruby/1.9.1/net/http.rb:2093:in `initialize'
from C:/Program Files (x86)/Ruby/lib/ruby/1.9.1/net/http.rb:1026:in `new'
from C:/Program Files (x86)/Ruby/lib/ruby/1.9.1/net/http.rb:1026:in `get'
from C:/Users/Administrador/Desktop/1.rb:59:in `block in <main>'
from C:/Program Files (x86)/Ruby/lib/ruby/1.9.1/net/http.rb:745:in `start'
from C:/Program Files (x86)/Ruby/lib/ruby/1.9.1/net/http.rb:557:in `start'
from C:/Users/Administrador/Desktop/1.rb:48:in `<main>'
有一个名为 Open URI 的标准库，其级别高于 Net HTTP。它自动遵循重定向：
require 'open-uri'
file = open("http://soundcloud.com/stereo-f---/cohete-amigo/download")
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