How to Download a Binary File Over Http

How do I download a binary file over HTTP?

The simplest way is the platform-specific solution:

 #!/usr/bin/env ruby
`wget http://somedomain.net/flv/sample/sample.flv`

Probably you are searching for:

require 'net/http'
# Must be somedomain.net instead of somedomain.net/, otherwise, it will throw exception.
Net::HTTP.start("somedomain.net") do |http|
    resp = http.get("/flv/sample/sample.flv")
    open("sample.flv", "wb") do |file|
        file.write(resp.body)
    end
end
puts "Done."

Edit: Changed. Thank You.

Edit2: The solution which saves part of a file while downloading:

# instead of http.get
f = open('sample.flv')
begin
    http.request_get('/sample.flv') do |resp|
        resp.read_body do |segment|
            f.write(segment)
        end
    end
ensure
    f.close()
end

How to download binary file

Use response.bodyBytes:

void downloadFile(File f) async {
  var url = Uri.encodeFull('https://API_URL');
  var response = await http.post(url, headers: {HttpHeaders.authorizationHeader: 'Bearer '},});
  await f.writeAsBytes(response.bodyBytes);
}

I removed the Accept header as it made no sense. You're hinting the server that you'll expect JSON, whereas you really want a PDF.

How to properly send a binary file over http and download it using javascript?

Make this change and it might work

- .then(response => response.blob)

+ .then(response => response.blob())

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Regarding the response body

    #I can't return raw bytes so I transform it into a string
    'body' : output.getvalue().hex(),

you can't send back a hex string, you need to send the raw data. otherwise you would have to convert the hex back to binary as well on the client side before making a blob and later a objectURL

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As you may already know the browser will not save an attachment if you fetch it with ajax, what you have to do is "navigate" to the file to trigger the download. And since you are posting json data and converting it to excel you have to do a form submit to send the data over to the server instead of using ajax, since it's not a regular GET request?

<form hidden method="post" enctype="text/plain" action="url">
  <textarea name="json">{"a":12}</textarea>
  <input type="submit">
</form>

This would be better as you don't have to hold all data in the browsers memory before the file can be saved, besides, you can start saving the file much earlier

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