2.1.14 Section 7.1.5, Cross-Origin Request with Preflight
V0014
The specification states:
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To protect resources against cross-origin requests that could not originate from certain user agents before this specification existed a preflight request is made to ensure that the resource is aware of this specification. The result of this request is stored in a preflight result cache.
IE8 Mode, IE9 Mode, and IE10 Mode (All Versions)
Preflight is not supported.