How to make WordPress use protocol indepentent upload files?

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I am using FORCE_SSL_ADMIN in wp-config.php so everytime I upload a new image and inserted into the post, it is using SSL version

e.g.

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<img src="https://www.example.com/wp-content/uploads/2013/01/test.png" ..

My blog is using HTTP in the public side, so how to make the upload path as rotocol independent, e.g. 

<img src="//www.example.com/wp-content/uploads/2013/01/test.png" ..
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  1. You can define a function to remove the protocol and hook it to the attachment URL:

    function wpse_79958_remove_protocol_from_attachment($url) {
    $url = str_replace(array('http:', 'https:'), '', $url);
    return $url;
}
add_filter( 'attachment_link', 'wpse_79958_remove_protocol_from_attachment' );

    Also consider to use relative URLs for attachments by using WordPress builtin function wp_make_link_relative:

    add_filter( 'attachment_link', 'wp_make_link_relative' );

    Place this code to your functions.php. Not tested though.

    Update: already tested