How to read the attached file in http response using ruby? - ruby

Question

I am new to ruby programming.
I have learning about the file attachments in ruby. In this I was learned about how to attach the file in http request. But I was searched about how read and save the attached file locally in http response. But I did not get anything for this.
UPDATE :-
From ruby script I do a http request to the php program.
The source for request is,
payload={"id":"1004"}
uri = URI.parse("https://example.com/test.php")
request = Net::HTTP::Post.new(uri)
request.content_type = "application/json"
request.body = payload.to_json
# request.use_ssl = true
# request.verify_mode = OpenSSL::SSL::VERIFY_NONE
# logger.info "request body is #{request.body.inspect}"
response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true, verify_mode: OpenSSL::SSL::VERIFY_NONE,:read_timeout => 25 ) { |http| http.request(request) }
From test.php, validated the id if it is valid then in response attached the file contents.
The source for this is,
$filename="test.mp3";
if (file_exists($filename)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($filename));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($filename));
ob_clean();
flush();
readfile($filename);
# exit;
}
What I want is, in the ruby script for the http request one response will be received from server. From that response I have extract the file contents and store it in locally.
I was searched about how to process the file contents in response. But I didn't get anything.
Kindly help me how to do this in ruby.