How to send file by wp_remote_post?

I found an solution for this issue, i using wp_remote_post to send binary of file to server.

When processing data received on server, i use this code to get data of file 

$file = file_get_contents('php://input');

And i write it to temp file

$temp   = tmpfile();
fwrite($temp, $file);
$metadata = stream_get_meta_data($temp);

Do you have any other solution ? Please discuss with me to find best answers.

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