Foreign image sources

Image Serving supports access to source images on foreign HTTP and FTP servers.

To specify a foreign URL for a src= or a mask= command; simply delimit the entire embedded URL with curly braces:

…&src={ *[!DNL foreignUrl]*}&…

Full absolute URLs (if attribute::AllowDirectUrls is set) and URLs relative to attribute::RootUrl are permitted. An error occurs if an absolute URL is embedded and attribute:: AllowDirectUrls is 0, or if a relative URL is specified and attribute::RootUrl is empty.

Foreign images are cached by the server according to the caching headers included with the HTTP response.

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