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<p>GFW stands for ‘Great Fire Wall’. It is used for blocking some websites (like flickr.com) from China mainland. So people in China cannot see any pictures of flickr. This plugin will grab the pictures from flickr image library by your web server. So you need a web server that located in which flickr isn’t blocked, for example, US.</p>
<h3>Requirements</h3>
<ul>
<li>A web server that can visit flickr’s libraries directly</li>
<li>‘allow_url_fopen’ of php.ini should be “1”.</li>
</ul>


Flickr Over GFW

Flickr Over GFW is a plugin for people where flickr's image library is blocked. With this plugin, you can link any image from flickr freely and y …

jmarreros

<p>This Plugin allows to use an external image as Featured Image, this can be especially useful if you house your images in another location.</p>
<p>This Plugin is compatible with Nelio External Featured Image Metadata, so you can reuse your data in case you want to uninstall Nelio Plugin.</p>


External URL Featured Image

It is what I was looking for: simplicity.

$external_image = get_post_meta( $post->ID, '_dcms_eufi_img', true );

Works well for me

Use an external url image as Featured Image for your posts, pages, and other kind of post types.

Flickr Over GFW vs External URL Featured Image