水晶郎如何从HTTP获取二进制文件

问题描述

在Ruby中:

require 'open-uri'
download = open('http://example.com/download.pdf')
IO.copy_stream(download, '~/my_file.pdf')

如何在Crystal中做同样的事情?

How to do the same in Crystal?

推荐答案

我们可以执行以下操作:

We can do the following:

require "http/client"

HTTP::Client.get("http://example.org") do |response|
  File.write("example.com.html", response.body_io)
end

这仅将响应写入而没有任何HTTP标头到文件中. File.write也很聪明，不必首先将整个文件下载到内存中，而是在从给定的IO中读取块时写入文件.

This writes just the response without any HTTP headers to the file. File.write is also smart enough to not download the entire file into memory first, but to write to the file as it reads chunks from the given IO.

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