shawfactor

AJAX requests to this site from another (those containing an Origin header) will be allowed for any domain in your multisite setup, no configuration required
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LH Multisite CORS

Allows AJAX requests from other sites in your multisite network even if they are on another domain or subdomain

tstephenson

My use case is to allow content authors to write help pages in WordPress. 
This content is fetched and embedded into a single page application hosted on another domain.
AJAX requests to this site from another are typically disallowed by the browser’s security model. 
To permit legitimate uses the requesting browser may include an Origin header containing its domain. 
This plugin uses the Origin header to decide whether to allow the request or not. 
Allowed domains can be specified in the plugin’s Settings page.

WP-CORS

Allows AJAX requests from other sites to integrate content from your site using the CORS standard.

LH Multisite CORS vs WP-CORS