如何通过HTTP下载只有ruby的大文件

Question

我只需要通过HTTP下载文件的前几千字节.

我试过了

require 'open-uri'
url = 'http://example.com/big-file.dat'
file = open(url)
content = file.read(limit)

但它实际上下载了完整的文件.

Answer 1

这在使用套接字时似乎有效：

require 'socket'                  
host = "download.thinkbroadband.com"                 
path = "/1GB.zip" # get 1gb sample file
request = "GET #{path} HTTP/1.0\r\n\r\n"
socket = TCPSocket.open(host,80) 
socket.print(request)        

# find beginning of response body
buffer = ""                    
while !buffer.match("\r\n\r\n") do
  buffer += socket.read(1)  
end           

response = socket.read(100) #read first 100 bytes of body
puts response

我很好奇是否有“红宝石方式”。