Crystal lang how to get binary file from http

Question

In Ruby:

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

How to do the same in Crystal?

https://crystal-lang.org/api/0.21.0/HTTP/WebSocket/Protocol/StreamIO.html gives 404 — SeventhSon, Mar 03 '17 at 14:19

score 10 · Answer 1 · answered Mar 04 '17 at 06:57

10

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

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.

answered Mar 04 '17 at 06:57

Jonne Haß

4,792
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Thanks John, it's working to, but without http-headers – SeventhSon Mar 05 '17 at 00:52

score 1 · Answer 2 · edited Aug 29 '18 at 17:51

1

I found something that works:

require "http/request"
require "file"
res = HTTP::Client.get "https://ya.ru"
fl=File.open("ya.html","wb")
res.to_io(fl)
fl.close

edited Aug 29 '18 at 17:51

rogerdpack

62,887
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388

answered Mar 03 '17 at 15:57

SeventhSon

71
5

Of course you should prefer the block form of `File.open`. – Jonne Haß Aug 29 '17 at 07:36

Crystal lang how to get binary file from http

2 Answers2

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